My pdf files are not accecceble by pdf.js online pdf viewer

Informal
1

On my website

prak.rf.gd

i am using morzilla’s pdfviewer pdf.js but whenever visitor uploads a file (upload is successfull) and it goes into the ftp folder,

BUT the problem is when the file is viewed through website it can not be viewed some error come.

visit following link for clarity :
http://prak.rf.gd/online_pdf/web/viewer.html?file=upload/2.pdf

SEE THIS IMAGE I HAVE PDF 2.pdf

HELP ME PLEASE,

THANKS IN ADVANCE

2

I just checked http://prak.rf.gd/online_pdf/web/viewer.html?file=upload/2.pdf but the URL is working fine for me. Do you experience this issue on specific browsers? I use Google Chrome and it’s working for me.