Unable to load preview.js in salesforce lightning web component

I am developing a salesforce lightning web component to preview box files. I download these files from CDN and uploaded into salesforce static resource.

When I try to load these files I get the error undefined.

This is my js code

Promise.all([

loadScript(this, boxPreviewResource + '/js/bluebird.min.js'),

loadScript(this, boxPreviewResource + '/js/preview.js'),

loadStyle(this, boxPreviewResource + '/css/preview.css')

])

.then(() => {

console.log('EVI_Box_Preview_2_80_0 load success: ');

})

.catch(error => {

console.log('EVI_Box_Preview_2_80_0 load error: ', error);

});

This is the error I am getting

EVI_Box_Preview_2_80_0 load error: undefined

Please let me know if there is any resolution for this error.

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