Invalid game.dll path

Good morning,

These last days I'm facing an issue with the game: when I try to log with the phoenix launcher an error message appears:

"Invalid game.dll path. The path must point to a valid file and the file must be named game.dll"

The game was working perfectly before and I did no modification on the folder, as my knowledge in computer science is quite low, does someone have a solution to fix this?

Thanks a lot!