OK, so the problem you are having is because your <form> is missing the required id, which is there by default.
It should look something like
<form id="gform_3" method="post" enctype="multipart/form-data" action="..." _lpchecked="1">
Instead you’re missing the id attribute and you have a class
<form class=”cart” method=”post” enctype=”multipart/form-data”>
Which leads me to believe somewhere you’re using the gform_form_tag filter
https://www.gravityhelp.com/documentation/article/gform_form_tag/
What you need to do is work out where or how the id is being removed and make sure it doesnt.
The gform_form_tag can be a bit tricky to do advanced changes with, so if you get stuck with this the Gravity Forms support people can help out. But all you need to do is make sure you’re not removing the built in id attribute.
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This reply was modified 7 years, 9 months ago by ovann86.