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