Can’t run any ipynb files using Jupyter Lab or Jupyter Notebook (FileNotFoundError: [WinError 2] The system cannot find the file specified)

I have JupyterLab/JupyterNotebook running on Win10, along with Python and PyCharm on the side on Windows 10. Whenever I launch JupyterLab/JupyterNotebook I get the error stated below. I have tried reinstalling the Anaconda-distribution or any other instances of Python but it gives me the same error every time I launch JupyterLab/Notebook. I have also tried running it on a remote server with Win 7 but it gives me the exact same error. Part of me thinks that I made the same mistake while installing Anaconda, Python, and PyCharm and now I can’t revert it back. Any suggestions?

Traceback (most recent call last):
  File "E:anaconda3libsite-packagestornadoweb.py", line 1543, in _execute
    result = yield result
  File "E:anaconda3libsite-packagestornadogen.py", line 1099, in run
    value = future.result()
  File "E:anaconda3libsite-packagestornadogen.py", line 1107, in run
    yielded = self.gen.throw(*exc_info)
  File "E:anaconda3libsite-packagesnotebookservicessessionshandlers.py", line 73, in post
    type=mtype))
  File "E:anaconda3libsite-packagestornadogen.py", line 1099, in run
    value = future.result()
  File "E:anaconda3libsite-packagestornadogen.py", line 1107, in run
    yielded = self.gen.throw(*exc_info)
  File "E:anaconda3libsite-packagesnotebookservicessessionssessionmanager.py", line 79, in create_session
    kernel_id = yield self.start_kernel_for_session(session_id, path, name, type, kernel_name)
  File "E:anaconda3libsite-packagestornadogen.py", line 1099, in run
    value = future.result()
  File "E:anaconda3libsite-packagestornadogen.py", line 1107, in run
    yielded = self.gen.throw(*exc_info)
  File "E:anaconda3libsite-packagesnotebookservicessessionssessionmanager.py", line 92, in start_kernel_for_session
    self.kernel_manager.start_kernel(path=kernel_path, kernel_name=kernel_name)
  File "E:anaconda3libsite-packagestornadogen.py", line 1099, in run
    value = future.result()
  File "E:anaconda3libsite-packagestornadogen.py", line 315, in wrapper
    yielded = next(result)
  File "E:anaconda3libsite-packagesnotebookserviceskernelskernelmanager.py", line 148, in start_kernel
    super(MappingKernelManager, self).start_kernel(**kwargs)
  File "E:anaconda3libsite-packagesjupyter_clientmultikernelmanager.py", line 110, in start_kernel
    km.start_kernel(**kwargs)
  File "E:anaconda3libsite-packagesjupyter_clientmanager.py", line 259, in start_kernel
    **kw)
  File "E:anaconda3libsite-packagesjupyter_clientmanager.py", line 204, in _launch_kernel
    return launch_kernel(kernel_cmd, **kw)
  File "E:anaconda3libsite-packagesjupyter_clientlauncher.py", line 128, in launch_kernel
    proc = Popen(cmd, **kwargs)
  File "E:anaconda3libsubprocess.py", line 709, in __init__
    restore_signals, start_new_session)
  File "E:anaconda3libsubprocess.py", line 997, in _execute_child
    startupinfo)
FileNotFoundError: [WinError 2] The system cannot find the file specified

Answer

It seemed it had something to do with nb_conda. Once I reinstalled nb_conda using the command below, it worked for me.

conda install nb_conda