jquery-ui-1.7.3.custom.min.js: failed to open stream:

Hello,

I'm at my wits end. I'm getting all sorts of errors with the following syntax in syslog:

Mar 20 20:43:28 server drupal: http://mysite.org|1363826608|php|255.255.255.255|http://mysite.org/classified/91||0||Warning: file_get_contents(sites/all/modules/jquery_ui/jquery.ui/js/jquery-ui-1.7.3.custom.min.js): failed to open stream: No such file or directory in drupal_build_js_cache() (line 2519 of /var/www/prod/includes/common.inc).

Mar 20 20:45:01 server drupal: http://mysite.org|1363826701|php|255.255.255.255|http://mysite.org/en|http://mysite.org/en/user/1/notifications/subscriptions|1||Warning: file_get_contents(sites/all/modules/jquery_ui/jquery.ui/js/jquery-ui-1.7.3.custom.min.js): failed to open stream: No such file or directory in drupal_build_js_cache() (line 2519 of /var/www/prod/includes/common.inc).

These errors pop up on node creation, updates etc. And are among other things preventing notifications from being sent by my server.

If I disable Jquery UI, then I lose my Date Popup functions, which breaks a whole bunch of other stuff on my site...

Help !