How work with requotes?

Well, I've been reading about invalid price error, but I don´t know what is the problem of my code.

" At opening of a market order (OP_SELL or OP_BUY), only the latest prices of Bid (for selling) or Ask (for buying) can be used as open price. If operation is performed with a security differing from the current one, the MarketInfo() function must be used with MODE_BID or MODE_ASK parameter for the latest quotes for this security to be obtained. Calculated or unnormalized price cannot be applied. If there has not been the requested open price in the price thread or it has not been normalized according to the amount of digits after decimal point, the error 129 (ERR_INVALID_PRICE) will be generated. If the requested open price is fully out of date, the error 138 (ERR_REQUOTE) will be generated independently on the slippage parameter. If the requested price is out of date, but present in the thread, the position will be opened at the current price and only if the current price lies within the range of price+-slippage."

There is no RefreshRates() in your loop... So your prices can become old. This might help. If not, contact your Dealer.

void BuscarAbrir() { 
 int Slippage=10; 
 int MagicNumber; 
 string symbolo=Symbol(); 
 if (symbolo=="GBPUSD"){
  MagicNumber=185258471411;
 } 
 if (symbolo=="EURUSD"){MagicNumber=458555788512;} 
 if (symbolo=="NZDUSD"){MagicNumber=129999996613;} 
 if (symbolo=="USDCAD"){MagicNumber=123456741814;} 
 if (symbolo=="USDCHF"){MagicNumber=111112225415;} 
 if (symbolo=="EURCHF"){MagicNumber=128588888216;} 
 if (symbolo=="EURJPY"){MagicNumber=745698523657;} 
 if (symbolo=="GBPJPY"){MagicNumber=555555555228;} . . . 
 if (anterior && (comentar != -1)) { 
  if (Kumo == 1) Print("SELL signal"); 
  enviar = "SELL signal"; 
  int ticket = 0;   Arko = 0; 
  while ((ticket <= 0) && (Arko < Number)) { 
   while (!IsTradeAllowed()) Sleep(5000); 
   RefreshRates();
   ticket = OrderSend(Symbol(),OP_SELL,LotsRisk(StopLoss),Bid, Slippage,Bid + StopLoss * Point,Bid - TakeProfit * Point,Version,MagicNumber,0,Red); 
   if (ticket < 0) { 
    Print("Error opening SELL order! ",ErrorDescription(GetLastError())); 
    var_116 = "Error opening SELL order! " + ErrorDescription(GetLastError()); 
    Arko++; 
   } 
  } 
  comentar = -1; 
 } 
 else { 
  if (posterior && (comentar != 1)) { 
   if (Kumo == 1) Print("BUY signal"); 
   enviar = "BUY signal";
   ticket = 0; Arko = 0;
   while ((ticket <= 0) && (Arko < Number)) { 
    while (!IsTradeAllowed()) Sleep(5000);
    RefreshRates();     
    ticket = OrderSend(Symbol(),OP_BUY,LotsRisk(StopLoss),Ask,S lippage,Ask - StopLoss * Point,Ask + TakeProfit * Point,Version,MagicNumber,0,Blue); 
    if (ticket < 0) { 
     Print("Error opening BUY order! ",ErrorDescription(GetLastError())); 
     var_116 = "Error opening BUY order! " + ErrorDescription(GetLastError()); 
     Arko++; 
    } 
   } 
   comentar = 1;
  } 
 } 
}

I've been working fne for a while with the above suggestion but I missed two trades in this week.

I get the error: Trade not allowed or trade context is busy. I thought my code was ready to work with this.

If trade is not allowed the EA go to sleep for 5000, maybe this sleeping time is too high (the EA works on M15 chart and take signals for the close of previous bar, so the EA has 15 minutes for send an order)???? Maybe there is no way to catch all trades???

I really don´t like when I miss trades.

Any new suggestion??

void BuscarAbrir()
{
if (var_752 && (var_764 != -1))
   {
   if (Kumo == 1) Print("SELL signal");
   int ticket = 0;
   Arko = 0;
   while ((ticket <= 0) && (Arko < Number))//Number is 20
      {
      while (!IsTradeAllowed()) Sleep(5000);
      RefreshRates();
      ticket = OrderSend(Symbol(),OP_SELL,LotsRisk(StopLoss),Bid,Slippage,Bid + StopLoss * Point,Bid - TakeProfit * Point,Version,MagicNumber,0,Red);
      if (ticket < 0)
         {
         Print("Error opening SELL order! ",ErrorDescription(GetLastError()));
         Arko++;
         }
      }
   var_764 = -1;
   }
      else
   {
   if (var_748 && (var_764 != 1))
      {
      if (Kumo == 1) Print("BUY signal");
      ticket = 0;
      Arko = 0;
      while ((ticket <= 0) && (Arko < Number))//Number is 20
         {
         while (!IsTradeAllowed()) Sleep(5000);
         RefreshRates();
         ticket = OrderSend(Symbol(),OP_BUY,LotsRisk(StopLoss),Ask,Slippage,Ask - StopLoss * Point,Ask + TakeProfit * Point,Version,MagicNumber,0,Blue);
         if (ticket < 0)
            {
            Print("Error opening BUY order! ",ErrorDescription(GetLastError()));
            Arko++;
            }
         }
      var_764 = 1;
      }
   }
}