3D FlipBook - I bought JQuuery Plugin and getting instance.node.FlipBook' is undefined error

Hi, I bought JQuery plugin of yearly subscription. The free version was working perfectly but when I replaced the files with the pro version I am not able to run my books gallery properly and getting following error: 3d-flip-book

[Error] TypeError: undefined is not an object (evaluating '_libs.PDFJS.workerSrc=(window.PDFJS_LOCALE?PDFJS_LOCALE:{pdfJsWorker:"js/pdf.worker.js",pdfJsCMapUrl:"cmaps/"}).pdfJsWorker') (anonymous function) (3dflipbook.min.js:2:23440) webpack_require (3dflipbook.min.js:1:228) (anonymous function) (3dflipbook.min.js:8:16346) webpack_require (3dflipbook.min.js:1:228) (anonymous function) (3dflipbook.min.js:1:17787) webpack_require (3dflipbook.min.js:1:228) (anonymous function) (3dflipbook.min.js:5:10461) webpack_require (3dflipbook.min.js:1:228) (anonymous function) (3dflipbook.min.js:3:13265) webpack_require (3dflipbook.min.js:1:228) (anonymous function) (3dflipbook.min.js:2:31295) webpack_require (3dflipbook.min.js:1:228) (anonymous function) (3dflipbook.min.js:17:3770) __webpack_require__ (3dflipbook.min.js:1:228) (anonymous function) (3dflipbook.min.js:1:981) Global Code (3dflipbook.min.js:1:1008) [Error] TypeError: instance.node.FlipBook is not a function. (In 'instance.node.FlipBook(instance.options)', 'instance.node.FlipBook' is undefined) (anonymous function) (example1.html:131) dispatch (jquery.min.js:3:10321) trigger (jquery.min.js:4:5814) (anonymous function) (jquery.min.js:4:6326) each (jquery.min.js:2:2820) fb3dModalShow (lightbox.js:46) (anonymous function) (lightbox.js:60)