error 059, error 021, помогите исправить

[Timka_Mylife]

C:\Users\HP\Desktop\mylife.pwn(42209) : error 059: function argument may not have a default value (variable "radius")
C:\Users\HP\Desktop\mylife(42210) : error 021: symbol already defined: "ProхDetector"

А вот сам stock

}
stock ProхDetector(Float:radius = 30.0, playerid, text[], col1 = 0xFFFFFFFF, col2 = 0xCCCCCCFF, col3 = 0x999999FF, col4 = 0x666666FF, col5 = 0x333333FF)
{
	new Float:x, Float:y, Float:z;
	GetPlayerPos(playerid, x, y, z);
	new Float:dist, virtualworld = GetPlayerVirtualWorld(playerid), interior = GetPlayerInterior(playerid);
	for(new i; i < MAX_PLAYERS; i++)
	{
		if(virtualworld != GetPlayerVirtualWorld(i) || interior != GetPlayerInterior(i)) continue;
		dist = GetPlayerDistanceFromPoint(i, x, y, z);
		if(dist < radius / 16) SendClientMessage(i, col1, text);
		else if(dist < radius / 8) SendClientMessage(i, col2, text);
		else if(dist < radius / 4) SendClientMessage(i, col3, text);
		else if(dist < radius / 2) SendClientMessage(i, col4, text);
		else if(dist < radius) SendClientMessage(i, col5, text);
	}
	return 1;
}