Mad Scientist explained why you are getting that error message. Clive and Mołot explained that jQuery questions are off-topic for us.
The reason why jquery is marked as synonym of javascript on Drupal Answers are essentially two:
- On Drupal Answers, those two tags are synonyms, which means that a question about using jQuery on Drupal is for us a normal question about JavaScript. This doesn't mean that for other sites those tags are synonyms; that is quite not true on Stack Overflow where, anyway, a question about plain JavaScript will get the _jquery_tag removed.
- The synonym has been set to avoid keeping to edit questions that use jquery. This includes questions migrated from other sites.