title: There's a kernel i can't delete or choose in jupyterlab
body: <p>There's a kernel called 'ml' i can't delete or choose in jupyterlab.</p>
  <p><a href="https://i.stack.imgur.com/Tq55x.jpg" rel="nofollow noreferrer">jupyter picture</a></p>
  <p>I created the env 'ml', and i couldn't remember whether i delete it.One day i found i can't choose it in jupyterlab, with the error message below:</p>
  <pre class="lang-sh prettyprint-override"><code>Traceback (most recent call last):
    File &quot;C:\Users\editc\Anaconda3\lib\site-packages\tornado\web.py&quot;, line 1699, in _execute
      result = await result
    File &quot;C:\Users\editc\Anaconda3\lib\site-packages\tornado\gen.py&quot;, line 742, in run
      yielded = self.gen.throw(*exc_info)  # type: ignore
    File &quot;C:\Users\editc\Anaconda3\lib\site-packages\notebook\services\sessions\handlers.py&quot;, line 72, in post
      type=mtype))
    File &quot;C:\Users\editc\Anaconda3\lib\site-packages\tornado\gen.py&quot;, line 735, in run
      value = future.result()
    File &quot;C:\Users\editc\Anaconda3\lib\site-packages\tornado\gen.py&quot;, line 742, in run
      yielded = self.gen.throw(*exc_info)  # type: ignore
    File &quot;C:\Users\editc\Anaconda3\lib\site-packages\notebook\services\sessions\sessionmanager.py&quot;, line 88, in create_session
      kernel_id = yield self.start_kernel_for_session(session_id, path, name, type, kernel_name)
    File &quot;C:\Users\editc\Anaconda3\lib\site-packages\tornado\gen.py&quot;, line 735, in run
      value = future.result()
    File &quot;C:\Users\editc\Anaconda3\lib\site-packages\tornado\gen.py&quot;, line 742, in run
      yielded = self.gen.throw(*exc_info)  # type: ignore
    File &quot;C:\Users\editc\Anaconda3\lib\site-packages\notebook\services\sessions\sessionmanager.py&quot;, line 101, in start_kernel_for_session
      self.kernel_manager.start_kernel(path=kernel_path, kernel_name=kernel_name)
    File &quot;C:\Users\editc\Anaconda3\lib\site-packages\tornado\gen.py&quot;, line 735, in run
      value = future.result()
    File &quot;C:\Users\editc\Anaconda3\lib\site-packages\tornado\gen.py&quot;, line 209, in wrapper
      yielded = next(result)
    File &quot;C:\Users\editc\Anaconda3\lib\site-packages\notebook\services\kernels\kernelmanager.py&quot;, line 168, in start_kernel
      super(MappingKernelManager, self).start_kernel(**kwargs)
    File &quot;C:\Users\editc\Anaconda3\lib\site-packages\jupyter_client\multikernelmanager.py&quot;, line 110, in start_kernel
      km.start_kernel(**kwargs)
    File &quot;C:\Users\editc\Anaconda3\lib\site-packages\jupyter_client\manager.py&quot;, line 259, in start_kernel
      **kw)
    File &quot;C:\Users\editc\Anaconda3\lib\site-packages\jupyter_client\manager.py&quot;, line 204, in _launch_kernel
      return launch_kernel(kernel_cmd, **kw)
    File &quot;C:\Users\editc\Anaconda3\lib\site-packages\jupyter_client\launcher.py&quot;, line 138, in launch_kernel
      proc = Popen(cmd, **kwargs)
    File &quot;C:\Users\editc\Anaconda3\lib\subprocess.py&quot;, line 775, in __init__
      restore_signals, start_new_session)
    File &quot;C:\Users\editc\Anaconda3\lib\subprocess.py&quot;, line 1178, in _execute_child
      startupinfo)
  FileNotFoundError: [WinError 2] 系统找不到指定的文件。
  </code></pre>
  <p>I tried to reinstall the anaconda and delete all the files of anaconda, it still there and i can't delete it.</p>