[otrs] Error after 5.0.6 to 5.0.8 update

After upgrading from 5.0.6 to 5.0.8, I receive an Internal Server Error when attempting to load the Package Manager page. The error that shows up in the Apache log is: Undefined subroutine &Kernel::Modules::AdminPackageManager::Translatable called at /opt/otrs//Kernel/Modules/AdminPackageManager.pm line 1357.\n Any suggestions on how to fix this? Thanks, Dan