Hi,
1. Plugin defect should not happen.
I'm not able to reproduce it using your links.
Please anble debug mode and provide a log.
2. Looks like you haven't even bothered looking up that errormessage in our forum.
An explanation of that errormessage can even be viewed inside JDownloader.
Screenshot:
Regardless of the error you are getting: Those links are failing for you due to cutcaptcha.