Error in PHP form
Description of the issue
When a web form which has worked perfectly in the past is accessed online, it shows an error message above a radio button input field.
What would be a possible cause for this error?
Steps to reproduce the problem
Link to the form: http://forms.danahall.org/apply/app_int.php
Exact text of any error message(s) that appear
Notice: Only variable references should be returned by reference in C:\Program Files (x86)\FileMaker\FileMaker Server\Web Publishing\publishing-engine\php\FileMaker\Implementation\LayoutImpl.php on line 37