Wrong parameters count error.

int init(){}
int deinit(){}

int BarsCount=0;


bool openlong()
   {//Write open LONG TRADE conditions here.
      
   }
   
bool openshort()
   {//Write open SHORT TRADE conditions here.
   
   }

bool closelong()
   {//Write close LONG TRADE conditions here.
   
   }

bool closeshort()
   {//Write close SHORT TRADE conditions here.
   
   }   

bool xopenlong()
   {// Actual order execution here for OPEN LONG TRADE.
   
   }
   
bool xopenshort()
   {//Actual order execution here for OPEN SHORT TRADE.
   
   }

bool xcloselong()
   {//Actual order execution for CLOSE LONG TRADE.
   
   }
   
bool xcloseshort()
   {//Actual order execution for CLOSE SHORT TRADE.
   
   }

int start()
  {
   if (Bars > BarsCount)
   {
      BarsCount=Bars;
      
      {//All indicators go in here...
      
      
      }
            
      if (openlong(true))   xopenlong();
      if (openshort(true))  xopenshort();
      if (closelong(true))  xcloselong();
      if (closeshort(true)) xcloseshort();
   }
  }

Can anyone please point out the error ? It says wrong parameters count error.