Groove Agent 5 deleting kit when trying to save

I have a problem when trying to re-export kit, usually when also trying to export the samples, I get an error message (see screenshot), indicating to “make sure files are not in use by HALion or another application” (THEY ARE NOT). After the message, the previously saved kit that I’m wanting to update is DELETED! Why??? Fortunately, the kit is still open in Cubase and plain saving it (vs export) will work, but why is Groove Agent deleting it/them|?|?|?!