redirect form after submitting

Hi Guys,

until now I didn't had any problem with the forms but now after submitting a form I gave an url to redirect the user but whatever I set in the form i got to the 404 page and this text appears in the url:,,%22isClosed%22:false,%22closedMessage%22:%22This%20form%20is%20no%20longer%20accepting%20submissions.%22%7D

Me myself and the submitter got the feedback and the email with the submission but there is something with the redirection I can't resolve.
Thanks for any help,

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