Mysql2 ::错误：INSERT命令拒绝用户'username' @ 'host'表'schema_migrations'：INSERT INTO`schema_migrations`（`version`）VALUES（''）

我正在尝试运行 heroku run rake db:migrate -r staging 但我收到此错误 .

Mysql2::Error: INSERT command denied to user 'username'@'host' for table 'schema_migrations': INSERT INTO `schema_migrations` (`version`) VALUES ('20170208234859')
rake aborted!
StandardError: An error has occurred, all later migrations canceled:

Mysql2::Error: INSERT command denied to user 'username'@'host' for table 'schema_migrations': INSERT INTO `schema_migrations` (`version`) VALUES ('20170208234859')/app/vendor/bundle/ruby/2.2.0/gems/activerecord-4.1.4/lib/active_record/connection_adapters/abstract_mysql_adapter.rb:303:in `query'
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-4.1.4/lib/active_record/connection_adapters/abstract_mysql_adapter.rb:303:in `block in execute'
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-4.1.4/lib/active_record/connection_adapters/abstract_adapter.rb:373:in `block in log'
/app/vendor/bundle/ruby/2.2.0/gems/activesupport-4.1.4/lib/active_support/notifications/instrumenter.rb:20:in `instrument'
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-4.1.4/lib/active_record/connection_adapters/abstract_adapter.rb:367:in `log'
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-4.1.4/lib/active_record/connection_adapters/abstract_mysql_adapter.rb:303:in `execute'
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-4.1.4/lib/active_record/connection_adapters/mysql2_adapter.rb:228:in `execute'
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-4.1.4/lib/active_record/connection_adapters/mysql2_adapter.rb:250:in `exec_insert'
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-4.1.4/lib/active_record/connection_adapters/abstract/database_statements.rb:95:in `insert'
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-4.1.4/lib/active_record/connection_adapters/abstract/query_cache.rb:14:in `insert'
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-4.1.4/lib/active_record/relation.rb:64:in `insert'
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-4.1.4/lib/active_record/persistence.rb:502:in `_create_record'
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-4.1.4/lib/active_record/attribute_methods/dirty.rb:87:in `_create_record'
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-4.1.4/lib/active_record/callbacks.rb:306:in `block in _create_record'
/app/vendor/bundle/ruby/2.2.0/gems/activesupport-4.1.4/lib/active_support/callbacks.rb:82:in `run_callbacks'
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-4.1.4/lib/active_record/callbacks.rb:306:in `_create_record'
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-4.1.4/lib/active_record/timestamp.rb:57:in `_create_record'
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-4.1.4/lib/active_record/persistence.rb:482:in `create_or_update'
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-4.1.4/lib/active_record/callbacks.rb:302:in `block in create_or_update'
/app/vendor/bundle/ruby/2.2.0/gems/activesupport-4.1.4/lib/active_support/callbacks.rb:82:in `run_callbacks'
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-4.1.4/lib/active_record/callbacks.rb:302:in `create_or_update'
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-4.1.4/lib/active_record/persistence.rb:125:in `save!'
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-4.1.4/lib/active_record/validations.rb:57:in `save!'
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-4.1.4/lib/active_record/attribute_methods/dirty.rb:29:in `save!'
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-4.1.4/lib/active_record/transactions.rb:273:in `block in save!'
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-4.1.4/lib/active_record/transactions.rb:329:in `block in with_transaction_returning_status'
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-4.1.4/lib/active_record/connection_adapters/abstract/database_statements.rb:201:in `block in transaction'
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-4.1.4/lib/active_record/connection_adapters/abstract/database_statements.rb:209:in `within_new_transaction'
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-4.1.4/lib/active_record/connection_adapters/abstract/database_statements.rb:201:in `transaction'
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-4.1.4/lib/active_record/transactions.rb:208:in `transaction'
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-4.1.4/lib/active_record/transactions.rb:326:in `with_transaction_returning_status'
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-4.1.4/lib/active_record/transactions.rb:273:in `save!'
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-4.1.4/lib/active_record/validations.rb:41:in `create!'
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-4.1.4/lib/active_record/migration.rb:1023:in `record_version_state_after_migrating'
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-4.1.4/lib/active_record/migration.rb:993:in `block in execute_migration_in_transaction'
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-4.1.4/lib/active_record/migration.rb:1040:in `ddl_transaction'
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-4.1.4/lib/active_record/migration.rb:991:in `execute_migration_in_transaction'
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-4.1.4/lib/active_record/migration.rb:953:in `block in migrate'
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-4.1.4/lib/active_record/migration.rb:949:in `each'
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-4.1.4/lib/active_record/migration.rb:949:in `migrate'
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-4.1.4/lib/active_record/migration.rb:807:in `up'
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-4.1.4/lib/active_record/migration.rb:785:in `migrate'
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-4.1.4/lib/active_record/railties/databases.rake:34:in `block (2 levels) in <top (required)>'
/app/vendor/bundle/ruby/2.2.0/gems/bundler-1.13.7/lib/bundler/cli/exec.rb:74:in `load'
/app/vendor/bundle/ruby/2.2.0/gems/bundler-1.13.7/lib/bundler/cli/exec.rb:74:in `kernel_load'
/app/vendor/bundle/ruby/2.2.0/gems/bundler-1.13.7/lib/bundler/cli/exec.rb:27:in `run'
/app/vendor/bundle/ruby/2.2.0/gems/bundler-1.13.7/lib/bundler/cli.rb:332:in `exec'
/app/vendor/bundle/ruby/2.2.0/gems/bundler-1.13.7/lib/bundler/vendor/thor/lib/thor/command.rb:27:in `run'
/app/vendor/bundle/ruby/2.2.0/gems/bundler-1.13.7/lib/bundler/vendor/thor/lib/thor/invocation.rb:126:in `invoke_command'
/app/vendor/bundle/ruby/2.2.0/gems/bundler-1.13.7/lib/bundler/vendor/thor/lib/thor.rb:359:in `dispatch'
/app/vendor/bundle/ruby/2.2.0/gems/bundler-1.13.7/lib/bundler/cli.rb:20:in `dispatch'
/app/vendor/bundle/ruby/2.2.0/gems/bundler-1.13.7/lib/bundler/vendor/thor/lib/thor/base.rb:440:in `start'
/app/vendor/bundle/ruby/2.2.0/gems/bundler-1.13.7/lib/bundler/cli.rb:11:in `start'
/app/vendor/bundle/ruby/2.2.0/gems/bundler-1.13.7/exe/bundle:34:in `block in <top (required)>'
/app/vendor/bundle/ruby/2.2.0/gems/bundler-1.13.7/lib/bundler/friendly_errors.rb:100:in `with_friendly_errors'
/app/vendor/bundle/ruby/2.2.0/gems/bundler-1.13.7/exe/bundle:26:in `<top (required)>'
/app/bin/bundle:3:in `load'
/app/bin/bundle:3:in `<main>'
ActiveRecord::StatementInvalid: Mysql2::Error: INSERT command denied to user 'username'@'host' for table 'schema_migrations': INSERT INTO `schema_migrations` (`version`) VALUES ('20170208234859')
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-4.1.4/lib/active_record/connection_adapters/abstract_mysql_adapter.rb:303:in `query'
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-4.1.4/lib/active_record/connection_adapters/abstract_mysql_adapter.rb:303:in `block in execute'
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-4.1.4/lib/active_record/connection_adapters/abstract_adapter.rb:373:in `block in log'
/app/vendor/bundle/ruby/2.2.0/gems/activesupport-4.1.4/lib/active_support/notifications/instrumenter.rb:20:in `instrument'
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-4.1.4/lib/active_record/connection_adapters/abstract_adapter.rb:367:in `log'
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-4.1.4/lib/active_record/connection_adapters/abstract_mysql_adapter.rb:303:in `execute'
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-4.1.4/lib/active_record/connection_adapters/mysql2_adapter.rb:228:in `execute'
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-4.1.4/lib/active_record/connection_adapters/mysql2_adapter.rb:250:in `exec_insert'
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-4.1.4/lib/active_record/connection_adapters/abstract/database_statements.rb:95:in `insert'
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-4.1.4/lib/active_record/connection_adapters/abstract/query_cache.rb:14:in `insert'
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-4.1.4/lib/active_record/relation.rb:64:in `insert'
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-4.1.4/lib/active_record/persistence.rb:502:in `_create_record'
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-4.1.4/lib/active_record/attribute_methods/dirty.rb:87:in `_create_record'
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-4.1.4/lib/active_record/callbacks.rb:306:in `block in _create_record'
/app/vendor/bundle/ruby/2.2.0/gems/activesupport-4.1.4/lib/active_support/callbacks.rb:82:in `run_callbacks'
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-4.1.4/lib/active_record/callbacks.rb:306:in `_create_record'
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-4.1.4/lib/active_record/timestamp.rb:57:in `_create_record'
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-4.1.4/lib/active_record/persistence.rb:482:in `create_or_update'
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-4.1.4/lib/active_record/callbacks.rb:302:in `block in create_or_update'
/app/vendor/bundle/ruby/2.2.0/gems/activesupport-4.1.4/lib/active_support/callbacks.rb:82:in `run_callbacks'
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-4.1.4/lib/active_record/callbacks.rb:302:in `create_or_update'
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-4.1.4/lib/active_record/persistence.rb:125:in `save!'
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-4.1.4/lib/active_record/validations.rb:57:in `save!'
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-4.1.4/lib/active_record/attribute_methods/dirty.rb:29:in `save!'
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-4.1.4/lib/active_record/transactions.rb:273:in `block in save!'
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-4.1.4/lib/active_record/transactions.rb:329:in `block in with_transaction_returning_status'
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-4.1.4/lib/active_record/connection_adapters/abstract/database_statements.rb:201:in `block in transaction'
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-4.1.4/lib/active_record/connection_adapters/abstract/database_statements.rb:209:in `within_new_transaction'
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-4.1.4/lib/active_record/connection_adapters/abstract/database_statements.rb:201:in `transaction'
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-4.1.4/lib/active_record/transactions.rb:208:in `transaction'
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-4.1.4/lib/active_record/transactions.rb:326:in `with_transaction_returning_status'
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-4.1.4/lib/active_record/transactions.rb:273:in `save!'
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-4.1.4/lib/active_record/validations.rb:41:in `create!'
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-4.1.4/lib/active_record/migration.rb:1023:in `record_version_state_after_migrating'
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-4.1.4/lib/active_record/migration.rb:993:in `block in execute_migration_in_transaction'
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-4.1.4/lib/active_record/migration.rb:1040:in `ddl_transaction'
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-4.1.4/lib/active_record/migration.rb:991:in `execute_migration_in_transaction'
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-4.1.4/lib/active_record/migration.rb:953:in `block in migrate'
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-4.1.4/lib/active_record/migration.rb:949:in `each'
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-4.1.4/lib/active_record/migration.rb:949:in `migrate'
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-4.1.4/lib/active_record/migration.rb:807:in `up'
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-4.1.4/lib/active_record/migration.rb:785:in `migrate'
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-4.1.4/lib/active_record/railties/databases.rake:34:in `block (2 levels) in <top (required)>'
/app/vendor/bundle/ruby/2.2.0/gems/bundler-1.13.7/lib/bundler/cli/exec.rb:74:in `load'
/app/vendor/bundle/ruby/2.2.0/gems/bundler-1.13.7/lib/bundler/cli/exec.rb:74:in `kernel_load'
/app/vendor/bundle/ruby/2.2.0/gems/bundler-1.13.7/lib/bundler/cli/exec.rb:27:in `run'
/app/vendor/bundle/ruby/2.2.0/gems/bundler-1.13.7/lib/bundler/cli.rb:332:in `exec'
/app/vendor/bundle/ruby/2.2.0/gems/bundler-1.13.7/lib/bundler/vendor/thor/lib/thor/command.rb:27:in `run'
/app/vendor/bundle/ruby/2.2.0/gems/bundler-1.13.7/lib/bundler/vendor/thor/lib/thor/invocation.rb:126:in `invoke_command'
/app/vendor/bundle/ruby/2.2.0/gems/bundler-1.13.7/lib/bundler/vendor/thor/lib/thor.rb:359:in `dispatch'
/app/vendor/bundle/ruby/2.2.0/gems/bundler-1.13.7/lib/bundler/cli.rb:20:in `dispatch'
/app/vendor/bundle/ruby/2.2.0/gems/bundler-1.13.7/lib/bundler/vendor/thor/lib/thor/base.rb:440:in `start'
/app/vendor/bundle/ruby/2.2.0/gems/bundler-1.13.7/lib/bundler/cli.rb:11:in `start'
/app/vendor/bundle/ruby/2.2.0/gems/bundler-1.13.7/exe/bundle:34:in `block in <top (required)>'
/app/vendor/bundle/ruby/2.2.0/gems/bundler-1.13.7/lib/bundler/friendly_errors.rb:100:in `with_friendly_errors'
/app/vendor/bundle/ruby/2.2.0/gems/bundler-1.13.7/exe/bundle:26:in `<top (required)>'
/app/bin/bundle:3:in `load'
/app/bin/bundle:3:in `<main>'
Mysql2::Error: INSERT command denied to user 'username'@'host' for table 'schema_migrations'
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-4.1.4/lib/active_record/connection_adapters/abstract_mysql_adapter.rb:303:in `query'
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-4.1.4/lib/active_record/connection_adapters/abstract_mysql_adapter.rb:303:in `block in execute'
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-4.1.4/lib/active_record/connection_adapters/abstract_adapter.rb:373:in `block in log'
/app/vendor/bundle/ruby/2.2.0/gems/activesupport-4.1.4/lib/active_support/notifications/instrumenter.rb:20:in `instrument'
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-4.1.4/lib/active_record/connection_adapters/abstract_adapter.rb:367:in `log'
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-4.1.4/lib/active_record/connection_adapters/abstract_mysql_adapter.rb:303:in `execute'
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-4.1.4/lib/active_record/connection_adapters/mysql2_adapter.rb:228:in `execute'
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-4.1.4/lib/active_record/connection_adapters/mysql2_adapter.rb:250:in `exec_insert'
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-4.1.4/lib/active_record/connection_adapters/abstract/database_statements.rb:95:in `insert'
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-4.1.4/lib/active_record/connection_adapters/abstract/query_cache.rb:14:in `insert'
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-4.1.4/lib/active_record/relation.rb:64:in `insert'
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-4.1.4/lib/active_record/persistence.rb:502:in `_create_record'
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-4.1.4/lib/active_record/attribute_methods/dirty.rb:87:in `_create_record'
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-4.1.4/lib/active_record/callbacks.rb:306:in `block in _create_record'
/app/vendor/bundle/ruby/2.2.0/gems/activesupport-4.1.4/lib/active_support/callbacks.rb:82:in `run_callbacks'
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-4.1.4/lib/active_record/callbacks.rb:306:in `_create_record'
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-4.1.4/lib/active_record/timestamp.rb:57:in `_create_record'
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-4.1.4/lib/active_record/persistence.rb:482:in `create_or_update'
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-4.1.4/lib/active_record/callbacks.rb:302:in `block in create_or_update'
/app/vendor/bundle/ruby/2.2.0/gems/activesupport-4.1.4/lib/active_support/callbacks.rb:82:in `run_callbacks'
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-4.1.4/lib/active_record/callbacks.rb:302:in `create_or_update'
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-4.1.4/lib/active_record/persistence.rb:125:in `save!'
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-4.1.4/lib/active_record/validations.rb:57:in `save!'
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-4.1.4/lib/active_record/attribute_methods/dirty.rb:29:in `save!'
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-4.1.4/lib/active_record/transactions.rb:273:in `block in save!'
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-4.1.4/lib/active_record/transactions.rb:329:in `block in with_transaction_returning_status'
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-4.1.4/lib/active_record/connection_adapters/abstract/database_statements.rb:201:in `block in transaction'
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-4.1.4/lib/active_record/connection_adapters/abstract/database_statements.rb:209:in `within_new_transaction'
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-4.1.4/lib/active_record/connection_adapters/abstract/database_statements.rb:201:in `transaction'
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-4.1.4/lib/active_record/transactions.rb:208:in `transaction'
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-4.1.4/lib/active_record/transactions.rb:326:in `with_transaction_returning_status'
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-4.1.4/lib/active_record/transactions.rb:273:in `save!'
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-4.1.4/lib/active_record/validations.rb:41:in `create!'
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-4.1.4/lib/active_record/migration.rb:1023:in `record_version_state_after_migrating'
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-4.1.4/lib/active_record/migration.rb:993:in `block in execute_migration_in_transaction'
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-4.1.4/lib/active_record/migration.rb:1040:in `ddl_transaction'
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-4.1.4/lib/active_record/migration.rb:991:in `execute_migration_in_transaction'
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-4.1.4/lib/active_record/migration.rb:953:in `block in migrate'
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-4.1.4/lib/active_record/migration.rb:949:in `each'
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-4.1.4/lib/active_record/migration.rb:949:in `migrate'
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-4.1.4/lib/active_record/migration.rb:807:in `up'
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-4.1.4/lib/active_record/migration.rb:785:in `migrate'
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-4.1.4/lib/active_record/railties/databases.rake:34:in `block (2 levels) in <top (required)>'
/app/vendor/bundle/ruby/2.2.0/gems/bundler-1.13.7/lib/bundler/cli/exec.rb:74:in `load'
/app/vendor/bundle/ruby/2.2.0/gems/bundler-1.13.7/lib/bundler/cli/exec.rb:74:in `kernel_load'
/app/vendor/bundle/ruby/2.2.0/gems/bundler-1.13.7/lib/bundler/cli/exec.rb:27:in `run'
/app/vendor/bundle/ruby/2.2.0/gems/bundler-1.13.7/lib/bundler/cli.rb:332:in `exec'
/app/vendor/bundle/ruby/2.2.0/gems/bundler-1.13.7/lib/bundler/vendor/thor/lib/thor/command.rb:27:in `run'
/app/vendor/bundle/ruby/2.2.0/gems/bundler-1.13.7/lib/bundler/vendor/thor/lib/thor/invocation.rb:126:in `invoke_command'
/app/vendor/bundle/ruby/2.2.0/gems/bundler-1.13.7/lib/bundler/vendor/thor/lib/thor.rb:359:in `dispatch'
/app/vendor/bundle/ruby/2.2.0/gems/bundler-1.13.7/lib/bundler/cli.rb:20:in `dispatch'
/app/vendor/bundle/ruby/2.2.0/gems/bundler-1.13.7/lib/bundler/vendor/thor/lib/thor/base.rb:440:in `start'
/app/vendor/bundle/ruby/2.2.0/gems/bundler-1.13.7/lib/bundler/cli.rb:11:in `start'
/app/vendor/bundle/ruby/2.2.0/gems/bundler-1.13.7/exe/bundle:34:in `block in <top (required)>'
/app/vendor/bundle/ruby/2.2.0/gems/bundler-1.13.7/lib/bundler/friendly_errors.rb:100:in `with_friendly_errors'
/app/vendor/bundle/ruby/2.2.0/gems/bundler-1.13.7/exe/bundle:26:in `<top (required)>'
/app/bin/bundle:3:in `load'
/app/bin/bundle:3:in `<main>'
Tasks: TOP => db:migrate
(See full trace by running task with --trace)

我尝试了很多解决方案，但我还是无法解决 .

我试图向该用户授予所有权限，但它表示访问被拒绝 .

ERROR 1045（28000）：用户'用户名'@'％'的访问被拒绝（使用密码：是）

我也试图为这个用户展示补助金，但我得到了

mysql> show grants for 'username'@'host';

ERROR 1141（42000）：在主机'主机'上没有为用户'用户名'定义此类授权

当我运行 show databases; 时，（mysql）数据库不存在，只存在两个数据库（information_schema和我的数据库）

我也尝试过关于stackoverflow的许多问题的答案，但没有任何效果！