Errors saving pages.

{"error":"Coding error detected, it must be fixed by a programmer: PHP catchable fatal error","stacktrace":"* line 393 of \/lib\/setuplib.php: coding_exception thrown\n* line 294 of \/mod\/assign\/feedback\/editpdf\/classes\/page_editor.php: call to default_error_handler()\n* line 174 of \/mod\/assign\/feedback\/editpdf\/classes\/page_editor.php: call to assignfeedback_editpdf\\page_editor::add_annotation()\n* line 103 of \/mod\/assign\/feedback\/editpdf\/ajax.php: call to assignfeedback_editpdf\\page_editor::set_annotations()\n","debuginfo":"Argument 1 passed to assignfeedback_editpdf\\page_editor::add_annotation() must be an instance of assignfeedback_editpdf\\annotation, instance of stdClass given, called in [dirroot]\/mod\/assign\/feedback\/editpdf\/classes\/page_editor.php on line 174 and defined\nError code: codingerror","reproductionlink":"http:\/\/damyon.moodle.local\/im\/"}