BIG Problem - "Name of creator of this..."

So I have had many houers trying to get to the bottom of this… and nothing.
same problem in reach (but this time I wont get the achievement for sharing)
When I try to fileshare I get the familier text pop-up;
!NAME IS BLOCKED -Name of creator of this file not allowed on Xbox live.

What do I do?
I will go mad if I am to only get 995 AP score!
Please help me.

There must be other ppl having this problem, If anyone can redirect me to a similar topic at least…?