錯誤描述

本地Anaconda使用pip install jupyterlab后使用jupyter-lab打開窗口創(chuàng)建Terminal出現(xiàn)錯誤Launcher Error、Unhandled error、Dismiss

解決方案

通過查詢Anaconda窗口信息發(fā)現(xiàn)報錯如下：

Traceback (most recent call last):
      File "e:\anaconda3\envs\pytorch1.6.0\lib\site-packages\tornado\web.py", line 1702, in _execute
        result = method(*self.path_args, **self.path_kwargs)
      File "e:\anaconda3\envs\pytorch1.6.0\lib\site-packages\tornado\web.py", line 3173, in wrapper
        return method(self, *args, **kwargs)
      File "e:\anaconda3\envs\pytorch1.6.0\lib\site-packages\jupyter_server\terminal\api_handlers.py", line 26, in post
        name, _ = self.terminal_manager.new_named_terminal(**data)
      File "e:\anaconda3\envs\pytorch1.6.0\lib\site-packages\terminado\management.py", line 319, in new_named_terminal
        term = self.new_terminal(**kwargs)
      File "e:\anaconda3\envs\pytorch1.6.0\lib\site-packages\terminado\management.py", line 171, in new_terminal
        pty = PtyProcessUnicode.spawn(argv, env=env, cwd=options.get('cwd', None))
      File "e:\anaconda3\envs\pytorch1.6.0\lib\site-packages\winpty\ptyprocess.py", line 89, in spawn
        'executable: %s.' % command
    FileNotFoundError: The command was not found or was not executable: powershell.exe.

可以發(fā)現(xiàn)報錯的原因是JupyterLab在創(chuàng)建Ternimal時無法定位到PowerShell。為此，我通過CMD啟用PowerShell仍然失敗，如下所示：

因此懷疑時是環(huán)境變量中缺少`PowerShell`路徑，因此我找到`PowerShell`路徑并添加至環(huán)境變量，如下所示

完成后在CMD中輸入PowerShell即可進(jìn)入PowerShell模式

此時打開Anaconda啟動JupyterLab，即可正常啟動Terminal，如下所示：

總結(jié)

如果在Win10平臺使用JupyterLab無法正常啟動Terminal且報錯為FileNotFoundError: The command was not found or was not executable: powershell.exe.，只需要在環(huán)境變量中添加PowerShell路徑

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