How to pdf viewer

I have a problem with pdf viewer, articles that i submitted appear like this "

I use ojs 2.4.8 stable release. I just enabled pdf viewer plugin.

I dont know why i cant see The pdf of articles.

Hi @Matte,

Did something get lost in your above post? It looks like you were intending to include a screenshot or something.

Alec Smecher
Public Knowledge Project Team