class restore_create_question_filesextends restore_execution_step {
    protected functiondefine_execution() { }
}
Step 3:
Replace the class with the following code :
Codesnippet :
class restore_create_question_filesextends restore_execution_step {
    /** @var arrayQuestion-type specific component items cache. */
    private$qtypecomponentscache = array();
    /**
     *Preform the restore_create_question_files step.
     */
   protected function define_execution() {
        global $DB;
       // Track progress, as this task can take a long time.
       //$progress = $this->task->get_progress();
       //$progress->start_progress($this->get_name(),coreprogressbase::INDETERMINATE);
                
                
                $progress= $this->task->get_progress();
       $progress->start_progress($this->get_name(),core_backup_progress::INDETERMINATE);
        //Parentitemids of question_createds in backup_ids_temp are thecategory it is in.
        // MUST use a recordset, as there isno unique key in the first (or any) column.
        $catqtypes =$DB->get_recordset_sql("SELECT DISTINCT bi.parentitemid AScategoryid, q.qtype as qtype
                                              FROM {backup_ids_temp} bi
                                              JOIN {question} q ON q.id = bi.newitemid
                                             WHERE bi.backupid = ?
                                               AND bi.itemname =’question_created’
                                          ORDER BY categoryid ASC", array($this->get_restoreid()));
       $currentcatid = -1;
        foreach ($catqtypes as$categoryid => $row) {
            $qtype = $row->qtype;
           // Check if we are in a new category.
            if($currentcatid !== $categoryid) {
                // Reportprogress for each category.
               $progress->progress();
                if(!$qcatmapping =restore_dbops::get_backup_ids_record($this->get_restoreid(),
                       ‘question_category’, $categoryid)) {
                   // Something went really wrong, cannot find thequestion_category for the question_created records.
                   debugging(‘Error fetching target context for question’,DEBUG_DEVELOPER);
                    continue;
               }
                // Calculate source and targetcontexts.
                $oldctxid =$qcatmapping->info->contextid;
                $newctxid =$qcatmapping->parentitemid;
               $this->send_common_files($oldctxid, $newctxid, $progress);
               $currentcatid = $categoryid;
            }
           $this->send_qtype_files($qtype, $oldctxid, $newctxid,$progress);
        }
        $catqtypes->close();
       $progress->end_progress();
    }
    /**
    * Send the common question files to a new context.
     *
    * @param int             $oldctxid Old context id.
     *@param int             $newctxid New context id.
     * @paramcoreprogress  $progress Progress object to use.
     */
   private function send_common_files($oldctxid, $newctxid, $progress){
        // Add common question files (question andquestion_answer ones).
       restore_dbops::send_files_to_pool($this->get_basepath(),$this->get_restoreid(), ‘question’, ‘questiontext’,
               $oldctxid, $this->task->get_userid(), ‘question_created’,null, $newctxid, true, $progress);
       restore_dbops::send_files_to_pool($this->get_basepath(),$this->get_restoreid(), ‘question’, ‘generalfeedback’,
               $oldctxid, $this->task->get_userid(),’question_created’, null, $newctxid, true, $progress);
       restore_dbops::send_files_to_pool($this->get_basepath(),$this->get_restoreid(), ‘question’, ‘answer’,
               $oldctxid, $this->task->get_userid(), ‘question_answer’, null,$newctxid, true, $progress);
       restore_dbops::send_files_to_pool($this->get_basepath(),$this->get_restoreid(), ‘question’, ‘answerfeedback’,
               $oldctxid, $this->task->get_userid(),’question_answer’, null, $newctxid, true, $progress);
       restore_dbops::send_files_to_pool($this->get_basepath(),$this->get_restoreid(), ‘question’, ‘hint’,
               $oldctxid, $this->task->get_userid(), ‘question_hint’, null,$newctxid, true, $progress);
       restore_dbops::send_files_to_pool($this->get_basepath(),$this->get_restoreid(), ‘question’, ‘correctfeedback’,
               $oldctxid, $this->task->get_userid(),’question_created’, null, $newctxid, true, $progress);
       restore_dbops::send_files_to_pool($this->get_basepath(),$this->get_restoreid(), ‘question’, ‘partiallycorrectfeedback’,
               $oldctxid, $this->task->get_userid(),’question_created’, null, $newctxid, true, $progress);
       restore_dbops::send_files_to_pool($this->get_basepath(),$this->get_restoreid(), ‘question’, ‘incorrectfeedback’,
               $oldctxid, $this->task->get_userid(),’question_created’, null, $newctxid, true, $progress);
    }
   /**
     * Send the question type specific files to a newcontext.
     *
     * @param text            $qtype Theqtype name to send.
     * @param int             $oldctxid Oldcontext id.
     * @param int             $newctxid New contextid.
     * @param coreprogress  $progress Progress object touse.
     */
        
    private functionsend_qtype_files($qtype, $oldctxid, $newctxid, $progress) {
       if (!isset($this->qtypecomponentscache[$qtype])) {
           $this->qtypecomponentscache[$qtype] =backup_qtype_plugin::get_components_and_fileareas($qtype);
       }
        $components = $this->qtypecomponentscache[$qtype];
       foreach ($components as $component => $fileareas) {
           foreach ($fileareas as $filearea => $mapping) {
               restore_dbops::send_files_to_pool($this->get_basepath(),$this->get_restoreid(), $component, $filearea,
                       $oldctxid, $this->task->get_userid(), $mapping, null,$newctxid, true, $progress);
            }
        }
   }
}