Did you remember to call setType() for 'path'? Defaulting to PARAM_RAW cleaning.

line 1275 of \lib\formslib.php: call to debugging()
line 281 of \lib\formslib.php: call to moodleform->detectMissingSetType()
line 202 of \lib\formslib.php: call to moodleform->_process_submission()
line 46 of \local\codechecker\index.php: call to moodleform->moodleform()