Timthumb generates the following error message if it cannot create “index.html” file.

Warning: touch(): Utime failed: Permission denied in ../../timthumb.php on line 189

A TimThumb error has occured

The following error(s) occured:

• Could note create the index.html file.

To resolve this issue you’ll have to delete all files that exists inside the cache directory including “index.html” and/or “timthumb_cacheLastCleanTime.touch” file too.