Seems you have set a wrong or missing Bracket. Can you show me your complete code please.
Deutsche Fehlermeldungen mir deucht ich hab nen Landsmann (oder Umgebung) vor mir
GamePlay.gpHUDLogCenter("en", "msg red", null );
couldn't work
gpHUDLogCenter needs in this case a array of players as first argument (or null - null meens send message to all)
Added a example script