Updates and Missed error in OJS

Something updated from our server, not the OJS version. After this update everything is normal instead the “Archives” in editor’s dashboard as well as we are unable to open the PDF on the journal website both in current issue or Arhives.

Please help, reported error is attached along in the form of picture.

You may check the permissions of your files directory (as well as the permissions of the pdfJsViewer plugin directory). Apache needs to be granted access.