Disc wont load

Hello I am running the softmod on my wii and when I insert a backup to play It loads on the wii menu and I click the channel to play the game then the game doesn't start and IT gives me an error message to take the disc out and restart the wii and see owners manual I know Ive played my backups several times and now they wont play was wondering If its the disk because they was sony rw disc didnt know what else It could be if anyone could help it would be greatly appriciated thanks

Hello IT Is all disc but one and they are all done on the same brand disc which are just dvd-r they worked great for a month or so and now are giving me my problems I guess I will try to use a different brand to see if that is my problem or not