如何修复“内核已经死亡，自动重启失败”的错误？

Traceback (most recent call last):
  File "C:\Users\Closer\Anaconda2\lib\site-packages\tornado\web.py", line 1543, in _execute
    result = yield result
  File "C:\Users\Closer\Anaconda2\lib\site-packages\tornado\gen.py", line 1099, in run
    value = future.result()
  File "C:\Users\Closer\Anaconda2\lib\site-packages\tornado\concurrent.py", line 260, in result
    raise_exc_info(self._exc_info)
  File "C:\Users\Closer\Anaconda2\lib\site-packages\tornado\gen.py", line 1107, in run
    yielded = self.gen.throw(*exc_info)
  File "C:\Users\Closer\Anaconda2\lib\site-packages\notebook\services\sessions\handlers.py", line 73, in post
    type=mtype))
  File "C:\Users\Closer\Anaconda2\lib\site-packages\tornado\gen.py", line 1099, in run
    value = future.result()
  File "C:\Users\Closer\Anaconda2\lib\site-packages\tornado\concurrent.py", line 260, in result
    raise_exc_info(self._exc_info)
  File "C:\Users\Closer\Anaconda2\lib\site-packages\tornado\gen.py", line 1107, in run
    yielded = self.gen.throw(*exc_info)
  File "C:\Users\Closer\Anaconda2\lib\site-packages\notebook\services\sessions\sessionmanager.py", line 79, in create_session
    kernel_id = yield self.start_kernel_for_session(session_id, path, name, type, kernel_name)
  File "C:\Users\Closer\Anaconda2\lib\site-packages\tornado\gen.py", line 1099, in run
    value = future.result()
  File "C:\Users\Closer\Anaconda2\lib\site-packages\tornado\concurrent.py", line 260, in result
    raise_exc_info(self._exc_info)
  File "C:\Users\Closer\Anaconda2\lib\site-packages\tornado\gen.py", line 1107, in run
    yielded = self.gen.throw(*exc_info)
  File "C:\Users\Closer\Anaconda2\lib\site-packages\notebook\services\sessions\sessionmanager.py", line 92, in start_kernel_for_session
    self.kernel_manager.start_kernel(path=kernel_path, kernel_name=kernel_name)
  File "C:\Users\Closer\Anaconda2\lib\site-packages\tornado\gen.py", line 1099, in run
    value = future.result()
  File "C:\Users\Closer\Anaconda2\lib\site-packages\tornado\concurrent.py", line 260, in result
    raise_exc_info(self._exc_info)
  File "C:\Users\Closer\Anaconda2\lib\site-packages\tornado\gen.py", line 315, in wrapper
    yielded = next(result)
  File "C:\Users\Closer\Anaconda2\lib\site-packages\notebook\services\kernels\kernelmanager.py", line 148, in start_kernel
    super(MappingKernelManager, self).start_kernel(**kwargs)
  File "C:\Users\Closer\Anaconda2\lib\site-packages\jupyter_client\multikernelmanager.py", line 110, in start_kernel
    km.start_kernel(**kwargs)
  File "C:\Users\Closer\Anaconda2\lib\site-packages\jupyter_client\manager.py", line 259, in start_kernel
    **kw)
  File "C:\Users\Closer\Anaconda2\lib\site-packages\jupyter_client\manager.py", line 204, in _launch_kernel
    return launch_kernel(kernel_cmd, **kw)
  File "C:\Users\Closer\Anaconda2\lib\site-packages\jupyter_client\launcher.py", line 128, in launch_kernel
    proc = Popen(cmd, **kwargs)
  File "C:\Users\Closer\Anaconda2\lib\subprocess.py", line 394, in __init__
    errread, errwrite)
  File "C:\Users\Closer\Anaconda2\lib\subprocess.py", line 644, in _execute_child
    startupinfo)
WindowsError: [Error 2] The system cannot find the file specified

这是我得到的错误 . 我使用的是Python 3，然后由于某种原因我试图转移到python 2 . 我卸载anaconda，然后再次安装python 2 . 无论什么时候我打开jupyter笔记本，我收到消息说，

内核已经死亡，自动重启失败 . 内核无法重新启动 . 如果您无法重新启动内核，您仍然可以保存笔记本，但在重新打开笔记本之前，运行代码将不再有效 .

我尝试了Solution提供，但仍然得到相同的错误 . 我已经浪费了6个多小时试图修复 . 如果有人请帮助我解决问题，我们将不胜感激 .