Situation: You have a WordPress [http://wordpress.org] site and want to accept donations with Stripe [https://stripe.com]. You found theWP Stripe Extended plugin [http://michaelapproved.com/articles/a-wordpress-plugin-to-accept-donations-with-stripe] by Michael Khalili [http://michaelapproved.com], tried to install it, got an error message upon activation, and want to fix