--- view_revisions_by_content_type.module
+++ (clipboard)
@@ -47,7 +47,7 @@
 /**
  * Access callback. Mostly a clone of _node_revision_access().
  */
-function view_revisions_by_content_type_access($node) {
+function view_revisions_by_content_type_access($node, $op = 'view') {
   static $access = array();
   if (!isset($access[$node->vid])) {
     $node_current_revision = node_load($node->nid);