Error on launch

Hi I just purchased this Donation plug in and I installed it and it said successful. I tried to going to the control panel and then I get this error,  

0 Call to undefined method JApplicationAdministrator::isClient()

Im not sure what that means. Any ideas how to fix it?

Thanks,
Kristy

Hi Kristy,
This is strange issue, could you please submit ticket on category Joom Donation and provide your site url with super admin account. I will help you to solve the issue.
Thanks
Dam