HTTP ERROR 500, google analytics problem

Hi guys! We followed rules from this topic: https://calderaforms.com/doc/send-google-analytics-event-wordpress-form-submission/
When we paste the code from below in theme functions.php we get error from topic title. We are using “Avada” child theme. If you would like to test something I can create account for you on our webpage. Could you help us? Here is the code:
function slug_post_form_submission( obj ) {
var entry_id = obj.data.cf_id;
ga(‘send’, {
‘hitType’: ‘event’, // Required.
‘eventCategory’: ‘form’, // Required.
‘eventAction’: ‘click’, // Required.
‘eventLabel’: ‘Form Submission’,
‘eventValue’: entry_id
});
}
Thank you!