Hello,
I post this here because I could not reply to a post in an old discussion about the same subject (error: no permission). So this is actually not a question but an observation that might help others too:
To delete an aspect (evaluation criterion), one has to switch to code (<>) in the description fiels because there might be some code you can either see nor delete otherwise. Once everything is deleted, Moodle automatically removes the aspect.
Hope this might be helpful
Ulrike