youd dldi patched it? with what patch? DSTT autopatches, and the patch isnt readily available. you shouldnt need to patch it. try just copying it without patching it.
also, its possible your card has become corrupt. move all important files to your computer and reformat your micro SD card. then copy everything back. if that doesnt work, try redownloading DS Weather Report. I dont have any experience of that particular homebrew, so can only give general advice. try the things i mentioned. also, are any files in the correct place. check the readme if there is one for the correct file setup. Try all that and if it doesnt work, come back and i'll try to think of something else for you. Do you have cities.dat on your card in the same directory as the .nds file? Do you have the right .nds file(not the .sc.nds one)?