Only for VtigerCRM 6.1
There is no default ListView for the ModComments Module.
To fix this you need only do three small modifications.
$notPermittedModules = array('ModComments','Integration' ,'DashBoard');
$notPermittedModules = array('Integration' ,'DashBoard');
$restrictedModulesList = array('Emails', 'ProjectMilestone', 'ProjectTask', 'ModComments', 'ExtensionStore', 'ExtensionStorePro',
'ModComments',
class ModComments_ListView_Model extends Vtiger_ListView_Model {
public function getName() { return 'ModComments'; }