User Groups SQlite error


I am just a starter in Yii development.

I just installed the Usergroups extension from

I am using the sqlite database and tried to install on it.

Now firstly I have changed the installer controller file and added a case to install it on Sqlite database.

Everything worked fine, but when I am trying to login it is giving following error.

Property "UsergroupsCron.last_occurrence" is not defined.



I overcome this by ignoring the cronjob run line but Now i cannot access the root tools

Please help me

Here is my Install Controller file.