4 Errors Bitte um Hilfe

error 017: undefined symbol "string"
: error 017: undefined symbol "string"
error 029: invalid expression, assumed zero
fatal error 107: too many error messages on one line

Zeile von allen errors:

format(string,sizeof(string),""#SERVERTAG" : Der Server restartet in %i Sekunden!",Sekunden);

Hier neue errors

error 010: invalid function or declaration
Zeile: if(!success)
error 010: invalid function or declaration
Zeile: return SetTimerEx("HideInfoBox",3000,0,"i",playerid);
error 010: invalid function or declaration
Zeile: return 1;