invalid characters in key (only a-z, A-Z, 0-9, _, and - are allowed).
You shouldn't even be seeing this. Bizzeebeever told me to add this here so that we can get responsiveness working for all screens.
From Magnum Semi-RP Unturned Game Servers
invalid characters in key (only a-z, A-Z, 0-9, _, and - are allowed).