I'll suppress this error, but it would be interesting to know the cause. If you look in the browser developer tools, network tab, you should be able to look at the notifications.php request and see what happened to it. You can paste the data for it in a note here.
8: TypeError: $(...).select2 is not a function
http://127.0.0.1/demo./composr/themes/default/templates_cached/EN/global.js?1432401278 line 675 > eval
Couldn't find anything related with Firebug, will check with Chrome.
EDIT: No problems in Chrome, seems to be just Mozilla.
44: TypeError: $(...).sew is not a function
http://127.0.0.1/demo./composr/themes/default/templates_cached/EN/jquery_autocomplete.js?1432401294
Seems to be different errors that pop up and then disappear. Won't post anymore as they are probably unrelated to the original output.