Error when launching cemu games

Anyone no why I get an error about index and parameter length when trying to laugh wii I games? It was working before upgraded retrobat.

HELLO

no problem here

What's your controller ? Is it connected ?

Apologies for bad description I was walking a typing. When I launch I get an error "index and length must refer to a location within the string. Parameter name: length"

Can you show your roms\wiiu folder ?

tartifless wrote:Can you show your roms\wiiu folder ?

The games are found no problem just won't launch. If I go direct to cemu and launch then no problem. Picture below.

https://servimg.com/view/20589136/2