Hi, can you try uninstalling Karamba altogether. Then proceed to directories: C:\Program Files\Rhino 7\Plug-ins\Karamba and C:\Users\mattt\AppData\Roaming\McNeel\Rhinoceros\packages\7.0 to see if there are traces of Karamba left on your machine. Also you can do a search on your c: to see if there are any traces of karamba on your machine and make sure to delete them.
Then please try to reinstall Karamba