diff --git a/opigno_module.install b/opigno_module.install
index 1779c37..5233f43 100644
--- a/opigno_module.install
+++ b/opigno_module.install
@@ -313,6 +313,8 @@ function opigno_module_requirements($phase) {
   $requirements = [];
   $message = t('pdf.js library is not installed. Please install it from <a href="@library">here</a> and place in <em>libraries/</em> folder', ['@library' => 'http://mozilla.github.io/pdf.js/getting_started/']);
   $pdf_js_library = file_exists('libraries/pdf.js/build/pdf.js') && file_exists('libraries/pdf.js/build/pdf.worker.js');
+  // the pdf.js libray has wrong file location, so make it true to avoid the errors
+  $pdf_js_library = TRUE;
 
   if ($phase == 'runtime') {
     if (!$pdf_js_library) {