Savegame Manager GX data copying problem

So, I recently bought Animal Crossing City Folk, and my friend told me that there is a way to get hacked items. I looked up how, and found a website called aibohack. Then I downloaded the program and modified my rvforest.dat and put a bunch of hacked items onto it. Now the problem occurs when I try to load the save data into Save Game Manager GX. When I extract the normal game data to my sd card, then replace the non-hacked rvforest.dat with the hacked rvforest.dat, It gives me an Error that says "Error, Unable to copy datas" Does anyone know a workaround or fix?

 

Menuing does not work anymore. I want to know why this happens, I can't find any fixes as it seems I'm the only person with this issue