radgeek has been informed about it the past week, expect an update:
http://projects.radgeek.com/feedwordpress/
I get the same error, it was working until 2.5, 2.5.1 and feedwordpress show this error
I’m sorry, it works, you just have to add it in ../plugins/ and not in its own subfolder 🙂
Well I’d like it to work with WordPress 2.5 🙂