JavaScript Errors On Every Click / Windows 10

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Any click to a course or in the main menu of the software I'm greeted by the error shown in the picture attached. I think I'm running v 1.3.9, has there been an update?
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[This question was asked by a customer via Facebook] What's up with your website? It has some Wordpress errors. I wanted to read more about your finger drumming tutorials, but your site is non-functional.
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[This question was asked by a customer via email] I bought an AKAI MPD218 because I want to practice your finger drummer technics.I try to download the presets for the Akai 218 but it doesn't work. Could you maybe fix that?
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