Display error message

Hi,

I have a site, that has a submit form, but one must be logged in for that. And if the user is not logged in, it redirects it to the login page. And this all fine. My question is, what do I do to display the error message, "You must be logged to submit.", if the user is not logged in and tries to submit the form, but has to display the normal login page if not.

Thank you.

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