I can't use it correctly

[Shellyisnotme]

hi,
firstly, I want to express my gratitude for your selfless contribution.
and, when I use it to update my Nintendo switch game information, I met a problem. It said "failed to download metadate:值不能为null.参数名：source"
Please help me with this problem, thanks a lot！！！

[uwx]

What is the file extension of your Switch ROM? This extension is only for GameCube and Wii ROMs, it should do nothing when used on Switch ROMs. I don't know why it would show this error message. Also post your playnite.log and extension.log at the time of the error.