[Sensation]

Code:

new Float:tx,Float:ty,Float:tz;
		GetPlayerPos(listitem,tx,ty,tx);
		SetPlayerMapIcon(playerid,40,tx,ty,tz,42,0,MAPICON_LOCAL);
		new str[128];
		format(str,sizeof(str),"%s is marked on your map.",PlayerName(listitem));
		SCM(playerid,COLOR_LIGHTBLUE,string);

Hey guys i am making gps system for my taxi system but this code is not marking the ID's pos. How can i fix this. Please help me.