Error CS1503: Argument 1: cannot convert from 'double' to 'cAlgo.API.Bars'

Hello! 
I got an error, it says this:
Error CS1503: Argument 1: cannot convert from 'double' to 'cAlgo.API.Bars'

My code is the following:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using cAlgo.API;
using cAlgo.API.Collections;
using cAlgo.API.Indicators;
using cAlgo.API.Internals;

namespace cAlgo.Robots
{
    [Robot(AccessRights = AccessRights.None)]
    public class Elsőbotom : Robot
    {
        [Parameter(DefaultValue = "Hello world!")]
        public string Message { get; set; }
        
        
        
        //Indikátorok:
        private MacdCrossOver macd;
        private ParabolicSAR psar;


        protected override void OnStart()
        {
        
        
        //Debugging:
       // System.Diagnostics.Debugger.Launch();
       
       
        
                Print ("Kezdés");
                
                //Indikátorok betöltése indításkor:
               macd = Indicators.MacdCrossOver(26, 11, 7);
               psar = Indicators.ParabolicSAR( 0.001, 0.007, -30);
        }

   
        protected override void OnBar()
        {
            //A MACD cross-oláshoz szükséges adatok betöltése:
            var Histogram = macd.Histogram.Last(1);
            var PrevHistogram = macd.Histogram.Last(2);
            
            //A Parabolic SAR cross-oláshoz szükséges adatok betöltése:
            var Érték = psar.Result.Last(1);
            var ElÉrték = psar.Result.Last(2);
 
            
            
            //Mikor nyisson pozíciót?           
          if (Érték>ElÉrték)
          {                    
                  if (Histogram > 0 & PrevHistogram < 0)
                 {
                      ExecuteMarketOrder(TradeType.Buy, SymbolName, 1000, "MACDL");       
                 }         
                 
          }      
          
          
          if (Érték<ElÉrték)
          {
                if (Histogram < 0 & PrevHistogram > 0)
                 {
                       ExecuteMarketOrder(TradeType.Sell, SymbolName, 1000, "MACDS");               
                 }
                 
          }
          
          
            //Pozíciók zárása:
               if (Histogram < 0 && PrevHistogram > 0)
                {
                    var position = Positions.Find("MACDL");
                    if (position != null)
                    {
                        ClosePosition(position);
                    }
                }
                else if (Histogram > 0 && PrevHistogram < 0)
                {
                    var position = Positions.Find("MACDS");
                    if (position != null)
                    {
                        ClosePosition(position);
                    }
                }
                
       
            
        }

        protected override void OnStop()
        {
            Print ("Vége");
        }
    }
}  

My goal: I want the bot to take a long trade when the Parabolic SAR indicator goes up and the MACD indicator crosses
I want the bot to take short when the Parabolic SAR indicator goes down and the MACD indicator crosses


It says that the problem is with this line:
 psar = Indicators.ParabolicSAR( 0.001, 0.007, -30);

And the bot doesn't work now, it doesn't executes trades.

How can I fix it?