error:Call to a member function get_files() on string

error:Call to a member function get_files() on string

by bi hex -
Number of replies: 1
Debug info: Error code: generalexceptionmessage Stack trace: line 352 of /question/type/coderunner/question.php: Error thrown line 237 of /question/type/coderunner/question.php: call to qtype_coderunner_question->get_attached_files() line 626 of /question/behaviour/behaviourbase.php: call to qtype_coderunner_question->is_same_response() line 679 of /question/behaviour/behaviourbase.php: call to question_behaviour_with_save->is_same_response() line 114 of /question/behaviour/adaptive/behaviour.php: call to question_behaviour_with_save->process_save() line 93 of /question/behaviour/adaptive_adapted_for_coderunner/behaviour.php: call to qbehaviour_adaptive->process_save() line 95 of /question/behaviour/adaptive/behaviour.php: call to qbehaviour_adaptive_adapted_for_coderunner->process_submit() line 78 of /question/behaviour/adaptive_adapted_for_coderunner/behaviour.php: call to qbehaviour_adaptive->process_action() line 1299 of /question/engine/questionattempt.php: call to qbehaviour_adaptive_adapted_for_coderunner->process_action() line 729 of /question/engine/questionusage.php: call to question_attempt->process_action() line 610 of /question/engine/questionusage.php: call to question_usage_by_activity->process_action() line 1907 of /mod/quiz/attemptlib.php: call to question_usage_by_activity->process_all_actions() line 2254 of /mod/quiz/attemptlib.php: call to quiz_attempt->process_submitted_actions() line 89 of /mod/quiz/processattempt.php: call to quiz_attempt->process_attempt()