If your mod is missing 249, you followed the wrong guide.
Remod your system using our Softmod Any Wii guide which is linked in my signature.
Don'r format, delete, or uninstall anything. Just follow the guide and it will have you remod your system on top of whatever state your system is currently in.
Is the gamecube disk an actual game disk? a burned disk? or are you trying to play it off of USB? If it's the game disk, then there may be something wrong with the disk, since most Wii mods do not mess with how GameCube functionality work. If burned, you may have a bad rip or burn. If USB, then the fact that you are missing 249 would prevent most USB loaders from even running.