3D FlipBook - Setting up fake worker failed: "Failed to resolve module specifier 'js/pdf.worker.js

I am using simple html page no complex implementation and getting below error

Setting up fake worker failed: "Failed to resolve module specifier 'js/pdf.worker.js

though I am using the same sample code I got from zip file.

my console THREE.WebGLRenderer 125 three.min.js:184 THREE.WebGLRenderer 125 pdf.min.js:23 Warning: Setting up fake worker. Pdf.js:94 Error: Setting up fake worker failed: "Failed to resolve module specifier 'js/pdf.worker.js'". at pdf.min.js:23:244307