Invalid File? Help

[Jp]

If I ever try to edit my signature on the forums it keeps giving me this error "Invalid file"

What do I need to do to prevent this?

[z7654321]

When you're in the edit signature thingy, underneath the text thingy there's something that says "update signature picture" and there's an incomplete link in it, just erase the link and you should be able to update your signature.