3D FlipBook - Parsererror on test

Hello,

I'm trying to implement your script with the example PDF, but I get a javascript error: {readyState: 4, getResponseHeader: ƒ, getAllResponseHeaders: ƒ, setRequestHeader: ƒ, overrideMimeType: ƒ, …} with the responseText 'parsererror'. How can I fix this? Example can be found on https://mybeerexperience.com/nl/magazine.

Thanks.