OJS 3.0.2 PDF can`t be viewed with pdfJsViewer

After successful upgrade from OJS 3.0.1 to OJS 3.0.2 I receive errors while trying to view pdf galleys through this plugin. Although pdf can be downloaded. Downgrading the plugin has no effect. Errors in browser console:

Uncaught TypeError: Cannot read property 'firstElementChild' of null
    at PDFViewer (viewer.js:3918)
    at Object.pdfViewInitialize [as initialize] (viewer.js:4619)
    at HTMLDocument.webViewerLoad (viewer.js:6179) 

Uncaught Error: Unknown action from worker: ready
    at error (pdf.js:254)
    at Worker.messageHandlerComObjOnMessage (pdf.js:1534)

update: not working in chrome and working in firefox browser

and another update: selfresolved :confused:

Hi @Vitaliy,

Glad you got it going!

Alec Smecher
Public Knowledge Project Team

Dear Friend,
I am having the same problem.
In my case the download link also not working.
Can you suggest me a measure to rectify it.

Nope, it have resolved by itself in my case.

I am disappointed with this reply. I thought you did something that made it to run.
I need to search for solution…

What errors do you see in the browser and php error logs?