drupal 7: trying to make use of Compressing JS and CSS causes Major Error hi I want to enable the compression of my JS and CSS to speed up my drupal site, but when I tick these boxes my site breaks completely. I can't even reload the performance page to remove the tick!! Thankfully I leanred this sometime back so I open the perf page twice tick on one and apply, see error then save the other loaded page which resets the situation.

error message for either CSS or JS tick is

The website encountered an unexpected error. Please try again later.


Also I CAN set these ticks on my localhost verion of the site, I get this problem on the hosted site.

anyone know why I can't use these features?

edit. Also there is nothing in the logs when I get back into the site.

error below was shown when warnings and error were turned on to display

Error
Error message
PDOException: SQLSTATE[HY000]: General error: 1366 Incorrect integer value: 'WATCHDOG_ERR' for column 'severity' at row 1: INSERT INTO {watchdog} (uid, type, message, variables, severity, link, location, referer, hostname, timestamp) VALUES (:db_insert_placeholder_0, :db_insert_placeholder_1, :db_insert_placeholder_2, :db_insert_placeholder_3, :db_insert_placeholder_4, :db_insert_placeholder_5, :db_insert_placeholder_6, :db_insert_placeholder_7, :db_insert_placeholder_8, :db_insert_placeholder_9); Array ( [:db_insert_placeholder_0] =&gt; 1 [:db_insert_placeholder_1] =&gt; file [:db_insert_placeholder_2] =&gt; The specified file %file could not be copied to %destination. [:db_insert_placeholder_3] =&gt; a:2:{s:5:"%file";s:22:"temporary://fileFTC3lH";s:12:"%destination";s:64:"public://css/css_jZfSPTZv1KVtNJ48SyQgcHuPQjmI4wt9aqGhI5N-Vyg.css";} [:db_insert_placeholder_4] =&gt; WATCHDOG_ERR [:db_insert_placeholder_5] =&gt; [:db_insert_placeholder_6] =&gt; http://www.martynazoltaszek.com/admin/config/development/performance [:db_insert_placeholder_7] =&gt; http://www.martynazoltaszek.com/admin/config/development/performance [:db_insert_placeholder_8] =&gt; 87.74.16.7 [:db_insert_placeholder_9] =&gt; 1334073447 ) in dblog_watchdog() (line 157 of /home/martynaz/public_html/modules/dblog/dblog.module).
The website encountered an unexpected error. Please try again later.
There is probably an error with the file-system? Go to admin/config/media/file-system, check the settings or just hit the save button again. But backup your site befor you do this. Have you tried to upload a file? Do you get any other cache / temp error? Did you clear the cache?