diff --git a/mod/workshop/form/accumulative/lib.php b/mod/workshop/form/accumulative/lib.php
index 68c8cf3fddc..4a278c510a9 100644
--- a/mod/workshop/form/accumulative/lib.php
+++ b/mod/workshop/form/accumulative/lib.php
@@ -243,7 +243,7 @@ class workshop_accumulative_strategy implements workshop_strategy {
     /**
      * @see parent::get_assessments_recordset()
      */
-    public function get_assessments_recordset($restrict) {
+    public function get_assessments_recordset($restrict=null) {
         global $DB;
 
         $sql = 'SELECT s.id AS submissionid,
diff --git a/mod/workshop/form/numerrors/lib.php b/mod/workshop/form/numerrors/lib.php
index 02da64b4cfe..d319b1f8d9b 100644
--- a/mod/workshop/form/numerrors/lib.php
+++ b/mod/workshop/form/numerrors/lib.php
@@ -275,6 +275,20 @@ class workshop_numerrors_strategy implements workshop_strategy {
         return false;
     }
 
+    /**
+     * @see parent::get_assessments_recordset()
+     */
+    public function get_assessments_recordset($restrict=null) {
+        // todo
+    }
+
+    /**
+     * @see parent::get_dimensions_info()
+     */
+    public function get_dimensions_info() {
+        // todo
+    }
+
 ////////////////////////////////////////////////////////////////////////////////
 // Internal methods                                                           //
 ////////////////////////////////////////////////////////////////////////////////