Cannot rename cheat files from NO$GBAXXX.CHT to NO$GBA.CHT

"Cannot rename cheat files from NO$GBAXXX.CHT to NO$GBA.CHT"
what this exactly means?
I have Windows Vista and I am using NO$GBA and finally I have fixed everything with Pokemon Heart Gold and I am trying to add some AR codes --pls don't ask why I use codes, I have re-started this game 10 times now due to the freezing and black screens :(-- and I just want to get to Olivine City 'cause that was the last time until everything got effed up. When I try to add AR codes this message appears "Cannot rename cheat files from NO$GBAXXX.CHT to NO$GBA.CHT", please help me I beg you!!! :( what can I do to fix this?
:(:(

Maybe that will be one of the problem that most people have facing here...
Anti-piracy maybe? o.O
Don't mind me, though o.O

Just import the codes manually, via Utility>Cheats tab.