[Mic_H]

Код HTML:

new hp;
if(sscanf(params,  "ui", targetid, hp)) return SendClientMessage(playerid, 0x33AA33AA, "[BA:RP] Ubijen si od strane admina!");
else
	SetPlayerHealth(targetid, float(hp));

Mistake: sscanf(params, "ui", targetid, SetPlayerHealth)
SetPlayerHealth is a native-function.