(44597) : error 035: argument type mismatch (argument 2)

CMD:am(playerid, params[])
{
	if(PlayerInfo[playerid][pAdmin] != 0)
	{
		new toid, message[128];
		if(!sscanf(params, "is[128]", toid, message)) return SendClientMessageEx(playerid, "[a]dmin[m]essage", "[playerid] [message]");
		if(strlen(message) > 128) return SendClientMessageEx(playerid, "Your message cannot be longer than 128 characters.");
		if(!IsPlayerConnected(toid)) return SendClientMessageEx(playerid, "That player is not connected!");
		new string[128];
		format(string, "Admin message from %s: %s", GetPlayerNameEx(playerid), message);
		SendClientMessageEx(toid, COLOR_GREEN, string);
		format(string, "Admin %s [%d] > %s [%d]: %s", GetPlayerNameEx(playerid), playerid, GetPlayerNameEx(toid), toid, message);
		SendAdminMessage(COLOR_GREEN,string);
		Log("logs/adminmessage.log", string);
		PlayerInfo[playerid][pAMSSent] ++;
	}
	else
	{
		new message[80];
		if(!sscanf(params, "s[80]", message)) return SendClientMessageEx(playerid, "[a]dmin[m]essage", "[message]");
		if(strlen(message) > 80) return SendClientMessageEx(playerid, "Your message cannot be longer than 80 characters.");
		//if(strfind(message, "Falling", true) != -1) return Error(playerid, "Type (/falling) and a administrative person will be there to assist you right away!");
		new string[128];
		format(string, "Admin message from %s [%d]: %s", GetPlayerNameEx(playerid), playerid, message);
		SendAdminMessage(COLOR_GREEN,string);
		format(string, "Your message, %s, has been sent.", message);
		SendClientMessageEx(playerid, COLOR_GREEN, string);
		format(string, "Player %s [%d] > Admins: %s", GetPlayerNameEx(playerid), playerid, message);
		Log("logs/adminmessage.log", string);
	}
	return 1;
}

		format(string, "Admin message from %s: %s", GetPlayerNameEx(playerid), message); // THIS LINE
		SendClientMessageEx(toid, COLOR_GREEN, string);

format(string, sizeof(string), "Admin message from %s: %s", GetPlayerNameEx(playerid), message); // THIS LINE
SendClientMessageEx(toid, COLOR_GREEN, string);