Fatal error msg using Protected plugin

While attempting to test my protected site I received a blank screen that said:

"Fatal error: call to undefined method TheLib_1_0_14::store_get_clear() in /homepages/46/d551754431/htdocs/clicandbuilds/SocialMediaMarketAnalysis/wp-content-plugins/protected-content/apps/model/class-ms-model-plugin.php on line 252"

Your help will be greatly appreciated.

Thank you!

~Rose Marie James