Wii U Keystxt For Cemu !link! Here

If you are building a modern Cemu library using current dumping methods (NAND dumps and .wua files), you do not need keys.txt . However, if you are preserving an older library of extracted .rpx games, keys.txt is a functional, albeit aging, necessity. It gets the job done, but it represents the "old way" of Wii U emulation.

This means your keys.txt is either missing the key for that specific game or the Common Key is missing. wii u keystxt for cemu