[xir]

I think you need to change this line

pawn Code:

if(sscanf(params, "s", playerid)) return SendClientMessage(playerid, 0xFF0000AA, "Usage: \"/healme\"");

to

pawn Code:

if(sscanf(params, "u", playerid)) return SendClientMessage(playerid, 0xFF0000AA, "Usage: \"/healme\"");