Your Favourite "Error-Alerts" ???:-D

Mine is :     

Oops?! We noticed the following errors in your form:

• Don't be silly, you can't track yourself.

Not bad.

Any other suggestion? Or is it the only one you have in store?

Oops?! We noticed the following errors in your form:

• Don't be silly, you can't be a friend of yourself.

Oops?! We noticed the following errors in your form:

• Don't be silly, Erik has already the Premium Membership.

Oops?! We noticed the following errors in your form:

• Don't be silly, there are NO cheaters @ Chess.com.

Oops?! We noticed the following errors in your form:

• Don't be silly, you can't quit this group, you are indispensable.

Oops?! We noticed the following errors in your form:

• dpruess is currently not available for challenges. Try challenging kohai.

Edited, OD.  Disqualified. (The Explaining sentence starts with THE POINT, and is different colored as the "Oops?!"-line.)     

Oops?! We noticed the following errors in your form:

• Don't be silly, you are already silly

This is not an error alert, but I still like it and I'll take the risk to be deleted. The computer is commenting after the checkmate: "Play might have continued"

You do not have permission to send trophies to that user!

Oops?! We noticed the following errors in your form:

• Don't be silly, you can't join in this tournament, because it's for women only.

Must be the best! :D

How about this one?

Or this one:

A Fumbling Invite-Admin ??     

N.N. is already a member of this group
Invitations sent to 0 members.

Oops?! We noticed the following errors in your form:

• You are not allowed to block staff members or moderators.

You have already reached the maximum allowed rating for your membership level.
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