Hai… i have the same problem… with the pdf view… my OJS is 3.02. previously the pdf view is not in trouble. However somehow, today i got the problem… I got error message like this…
PDF.js v1.5.188 (build: 0e2d50f)
Message: Unexpected server response (204) while retrieving PDF “http://domain.ac.id/index.php/JSAI/article/download/15/11/”.
any helep please…