Error when adding modules to pipeline



I started building my pipeline. Unfortunately, although it seemed CP was running smoothly, it didn’t save my project’s content. After I rebuild most of the pipeline, CP stopped working everytime I tried to add another module (mostly ExportToSpreadsheet or other Data Tools). Everything looks ok, and I can also open the modules section, but cannot select any modules anymore. Also, I can’t save anything.

I uninstalled Java, Java DK & CP, all newest version. I am on a Mac.
Hope you can help me!