Footprint Not Working

# Description
When trying to generate configuration footprints, some error occurs but it is not visual to me what kind of error...

This is the stacktrace I get when trying to generate the configuration footprint:
```Added 20 configurations.
deepcave.evaluators.footprint (INFO): Added 20 configurations.
Starting to calculate distances and add border and random configurations...
deepcave.evaluators.footprint (INFO): Starting to calculate distances and add border and random configurations...
Found 100 configurations...
deepcave.evaluators.footprint (INFO): Found 100 configurations...
Added 14 border configs and 135 random configs.
deepcave.evaluators.footprint (INFO): Added 14 border configs and 135 random configs.
Total configurations: 169.
deepcave.evaluators.footprint (INFO): Total configurations: 169.
Getting MDS data...
deepcave.evaluators.footprint (INFO): Getting MDS data...
/Library/Developer/CommandLineTools/Library/Frameworks/Python3.framework/Versions/3.9/lib/python3.9/multiprocessing/resource_tracker.py:216: UserWarning: resource_tracker: There appear to be 1 leaked semaphore objects to clean up at shutdown
warnings.warn('resource_tracker: There appear to be %d '
```

The error message in the web UI only says: "The job failed. Check the logs or make sure the worker is still running. Most of the times, a simple restart might help."

I am not sure whether this is again a Mac issue or whether this problem also occurs on other platforms. I tried different runs of different folders and the problem is consistently showing up.