Getting this error message : Plugin could not be activated because it triggered a fatal error.

Hi there.
Getting this error message :
Plugin could not be activated because it triggered a fatal error.
Fatal error: Class 'Autoblog_Module_System' not found in /home/altyoga0905/public_html/kas/wp-content/plugins/autoblog/autoblogpremium.php on line 184

Please look into this asap.
Thanks.