The problem is that your other plugin may load another version of jQuery in which case the conflict will occur. To fix the issue you have to add
jQuery.noConflict();
before the
$(document).ready(…) call.
After this, you have to replace all $ signs with keword: jQuery in your script files.
This worked for me!
Sources:
https://forums.obdev.at/viewtopic.php?f=6&t=2951
https://groups.google.com/group/jquery-en/browse_thread/thread/2f47a1874e6423ae/b7ed8400d7034121?lnk=raot
