Update troubleshooting.md

Author: nicolaskruchten

Diff for: doc/python/troubleshooting.md

@@ -41,7 +41,9 @@ In order to follow the examples in this documentation site, you should have the
 
 ### Import Problems
 
-Most `import` problems or `AttributeError`s can be traced back to having multiple versions of `plotly` installed, for example once with `conda` and once with `pip`. It's often worthwhile to uninstall with both methods before following the [Getting Started](/python/getting-started) instructions from scratch with one or the other. You can run the following commands in a terminal to fully remove `plotly` before installing again:
+It's very important that you not have a file named `plotly.py` in the same directory as the Python script you're running, and this includes not naming the script itself `plotly.py`, otherwise importing `plotly` can fail with mysterious error messages.
+
+Beyond this, most `import` problems or `AttributeError`s can be traced back to having multiple versions of `plotly` installed, for example once with `conda` and once with `pip`. It's often worthwhile to uninstall with both methods before following the [Getting Started](/python/getting-started) instructions from scratch with one or the other. You can run the following commands in a terminal to fully remove `plotly` before installing again:
 
 ```bash
 $ conda uninstall plotly