Sorry I just saw that the folder inside include \ plugins did not have the same name as in js search.
changed the name of the folder, now I get the following error:jquery-1.11.2.min.js?9ae093d POST https://scf/include/plugins/Merging/ajax.php 500 (Internal Server Error)
send @ jquery-1.11.2.min.js?9ae093d
ajax @ jquery-1.11.2.min.js?9ae093d
(anonymous) @ VM6290
dispatch @ jquery-1.11.2.min.js?9ae093d
r.handle @ jquery-1.11.2.min.js?9ae093d