Elemental for inside list not wroking

Please review Image-2022-04-05-at-10.22.1....

Here we have used elemental form inside list field.
When i submit the form in front end getting error like Image-2022-04-05-at-10.24.5....

Please advice to solve the issue


Please provide some information about your version of Silverstripe, how you’ve implemented your code, etc. Remember, this is a community forum, so the more information you provide, the better chance you have of someone giving up their time to help out.