[CLOSED] Fatal error: Uncaught exception

After installation I have been trying to test if PHPIDS s start logging ...

But i ended up with the following (just from entering the base URL) www.mydomain.com

Fatal error: Uncaught exception 'Exception' with message 'Cache file couldn't be created' in 
/home/xxx/public_html/mydomain/sites/all/modules/phpids/IDS/Caching/File.php:138 Stack trace: #0 
/home/xxx/public_html/mydomain/sites/all/modules/phpids/IDS/Filter/Storage.php(264): IDS_Caching_File->setCache(Array) #1 
/home/xxx/public_html/mydomain/sites/all/modules/phpids/IDS/Filter/Storage.php(107): IDS_Filter_Storage->getFilterFromXML() #2 
/home/xxx/public_html/mydomain/sites/all/modules/phpids/IDS/Monitor.php(185): IDS_Filter_Storage->__construct(Object(IDS_Init)) #3 
/home/xxx/public_html/mydomain/sites/all/modules/phpids/phpids.module(81): IDS_Monitor->__construct(Array, Object(IDS_Init)) #4 
/home/xxx/public_html/mydomain/includes/module.inc(471): phpids_init() #5 
/home/xxx/public_html/mydomain/includes/common.inc(2563): module_invoke_all() #6 
/home/xxx/public_html/mydomain/includes/bootstrap.inc(1050): _drupal_bootstrap_full() #7 
/home/xxx/public_html/mydomain/includes/bootstrap. in 
/home/xxx/public_html/mydomain/sites/all/modules/phpids/IDS/Caching/File.php on line 138

the directory IDS/tmp in /home/xxx/public_html/mydomain/sites/all/modules/phpids/IDS/tmp does show permissons 666 (which i assume is correct). so i have not the slightest idea what could be the reason for this error ...

please help !