Try reading the wiki next time before posting a thread. It's got a lot of info -> http://wiki.dolphin-emu.org/index.php?title=Harvest_Moon:_Magical_Melody_%28GC%29
Click the Graphics button and go to the Hacks Tab. Make sure "Ignore Format Changes" is unchecked. Note, you can only uncheck this option from the DX9 or DX11 backend.
Also, for future reference, please do not make separate threads if you're having problems with the same game. Just ask again in that same thread if you feel your question was not properly answered (which it was, if you had read admin89's link).
Click the Graphics button and go to the Hacks Tab. Make sure "Ignore Format Changes" is unchecked. Note, you can only uncheck this option from the DX9 or DX11 backend.
Also, for future reference, please do not make separate threads if you're having problems with the same game. Just ask again in that same thread if you feel your question was not properly answered (which it was, if you had read admin89's link).