docs(#97): Add pycharm git error to common problems (#123)

doc/02_development/06_pycharm_setup.md

@@ -57,3 +57,23 @@ The last step is to set up the docker-compose integration.
 For this, please follow this [official guide](https://www.jetbrains.com/help/pycharm/using-docker-compose-as-a-remote-interpreter.html#docker-compose-remote), while selecting `./build/docker-compose.yml` as configuration file and `agent` as service.
 
 After the initial indexing, PyCharm will provide intelligent code feedback and refactoring options in Python.
+
+## 🚨 Common Problems
+
+* Error when committing via PyCharm (error message may vary):
+
+ ```shell
+ ...
+ .git/hooks/pre-commit: 9: ././build/hooks/pre-commit.d/20-markdown.sh: b5: not found
+ ```
+
+ This may happen if you installed b5 in your conda environment instead of the native one.
+ To fix this, install b5 in your native environment:
+
+ ```shell
+ conda deactivate
+ sudo apt-get install python pip
+ pip install b5
+ ```
+
+ After that, the commit should work!