Description

I was helping another Symfony user in a community, he was stuck with a form and he posted the following screenshot

So I explained to him the reason for this failure, but then I realized that indeed the exception message is misleading. As we know, it's not sufficient to call the Form::isSubmitted() method to ensure that the form is actually submitted.

The message should be changed to something like this:

Cannot check if an unsubmitted form is valid. Call Form::isSubmitted() and ensure that it's true before calling Form::isValid().

Example

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