It is a known very rare issue with the current release, I have already uploaded the fixed release to codecanyon, but it is not yet approved for download. Sometimes it takes a few days for them to approve.
I'm attaching the fixed plugin version to this thread. Please delete the one you are trying to activate, and download and install this one instead. The errors should not appear then anymore.
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If you like my products, don't forget to rate them on codecanyon :)