The first time that I inserted Animal Crossing: City Folk in my Wii U, it says the game could not be read. I cleaned the disc and inserted it back in and it still says my ACCF game is not working.

It could be either your disk or your Wii U.

If its your disk, you will have to get a new one.

If its your Wii U, you will have to send it in to Nintendo for repairs.

You can see if its the disk or the Wii U by inserting another disk. If that disk also doesn't work, then its most likely the Wii U.

It's not my disc. It's my Wii U! I think the disc laser is dirty in my Wii U system. So I don't need to get a new copy of Animal Crossing: City Folk.

Ok, good. If you have a Wii or another Wii U, you can still play it.

I think I have 2 Wiis. I have a white Wii and a black Wii.

UPDATE: I do not have the Black Wii anymore. I only have the white one.
My black Wii is broken.

I can't find my white Wii.

Gavinattwood, just to let you know, if you can't get your WiiU fixed, you will have lost your current game. Although you have the disk, if you play it on another Wii or WiiU, you will be starting over. Each Wii or WiiU stores the game information in the unit, and not onto the disk. I lost two towns this way when my older Wiis quit reading the disk. Like you, it stopped reading all my game disks. I was lucky in that my husband gave me his Wii, and when that one stopped working, my sister-in-law gave me hers when she bought a WiiU.

I found my white Wii!

Awesome! I'm glad you found it, and I hope you enjoy playing City Folk!