Retrieves keys blank page

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Hi

I got a blank page and these errors when i go to the "retrieve keys" option wich displays errors on:

Warning: ExtendedServerInfo::require_once(modules/atism/ATISManager.php) [extendedserverinfo.require-once]: failed to open stream: No such file or directory in /usr/local/psa/admin/plib/ExtendedServerInfo.php on line 1298

Fatal error: ExtendedServerInfo::require_once() [function.require]: Failed opening required 'modules/atism/ATISManager.php' (include_path='/usr/local/psa/admin/plib:/usr/local/psa/admin/javascripts:/usr/local/psa/admin/plib/locales:/usr/local/psa/admin/auto_prepend:/usr/local/psa/admin/htdocs/domains/databases/phpMyAdmin:/usr/local/psa/admin/htdocs/domains/databases/phpPgAdmin:/usr/local/psa/admin/plib/sb/pear') in /usr/local/psa/admin/plib/ExtendedServerInfo.php on line 1298

What's the problem please? thanks.

 

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I solved it by reinstalling the acronis trueimage module. but i don't use it (that's why i removed it). Is it really necessary?