Wood R4 save problem help

Hi all, I got a problem when i am starting up a game, after it finishes loading there is a note saying " the save data cannot be accessed. Please turn off power and reinsert the DS game card"What the hell is going on??

having a R4 DS, i think it is a clone.the Wood R4 is also for clone
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it is a new game i am loading without any savesthen it created a save and show me this errorI don't know what is going on

if your game data is not there, rename it to xxxx.sav to xxx.nds.sav