I've been fiddling with my anaconda, jupyter, IPython installations, and I honestly don't know how I ended up with this error. Can anyone help me resolve this so I can get back to running jupyter notebooks with Python 3.x? 

```
[C 17:01:34.358 NotebookApp] Bad config encountered during initialization:
[C 17:01:34.359 NotebookApp] The 'contents_manager_class' trait of <notebook.notebookapp.NotebookApp object at 0x1016caa90> instance must be a type, but 'jupytext.TextFileContentsManager' could not be imported

```

Thanks!