Reemplazar EntryAmount con:

double Entry_Amount;
input double MaxRiskPerTrade = 1;
input int Maximum_Lots = 5;
input double Minimum_Lots = 0.01;

Reemplazar void OnTick() con:

void OnTick()
{
int margin=(int) MarketInfo(_Symbol,MODE_MARGINREQUIRED);
Entry_Amount=(AccountBalance()*MaxRiskPerTrade/1000)/(Stop_Loss);
Entry_Amount = NormalizeEntrySize(Entry_Amount);
if(Time[0]>barTime)
{
barTime=Time[0];
OnBar();
}
}
double NormalizeEntrySize(double size) {
double minlot = MarketInfo(_Symbol, MODE_MINLOT);
double maxlot = MarketInfo(_Symbol, MODE_MAXLOT);
double lotstep = MarketInfo(_Symbol, MODE_LOTSTEP);
if (size <= minlot)
size = minlot;
if (size <=Minimum_Lots)
size = Minimum_Lots;
if (size >= maxlot)
size = maxlot;
if (size >=Maximum_Lots)
size = Maximum_Lots;
size = NormalizeDouble(size, _Digits);
return (size);
}