object name passed to ObjectType function cannot be an uninitialized or empty string

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Hi,
I got this "object name passed to ObjectType function cannot be an uninitialized or empty string
" error, and I've done my best to fix any possiblity....but failed. Please help me.

This is an indicator for trendline breakout alert. I guess error is about the LABEL "tpl".....but just guess.

//+------------------------------------------------------------------+
//|                                                         qsxyj.mq4 |
//|                       Copyright ?2006, MetaQuotes Software Corp. |
//|                                        http://www.metaquotes.net |
//+------------------------------------------------------------------+

#property link      "http://www.metaquotes.net"

#property indicator_chart_window
//+------------------------------------------------------------------+
//| Custom indicator initialization function                         |
//+------------------------------------------------------------------+

extern bool allowsound=1;  
extern bool allowalertwindow=0;
extern int timegap=5;
extern int keeptexttime=15;
extern int horizon=10;
extern int veritical=10;
extern int lineapart=20;
extern int textfont=10;
extern color textcolor=Orange;
extern string linename="Tr";

int PrevAlertTime = 0; 
int Prevtext=0;
double lastbreakprice=0;

int init()
  {
   return(0);
  }
int deinit()
  {
   if(ObjectFind("remind1")==0) ObjectDelete("remind1");
   if(ObjectFind("tpl")==0) ObjectDelete("tpl");
   if(ObjectFind("LINE1")==0) ObjectDelete("LINE1");   
   if(ObjectFind("LINE2")==0) ObjectDelete("LINE2"); 
   if(ObjectFind("LINE3")==0) ObjectDelete("LINE3"); 
   return(0);
  }                            
//+------------------------------------------------------------------+
int start()
  {
   int    i=ObjectsTotal();  
   int    j,yjx=0;
   double price1,dh,dl;
   string name1;
   
   
   dh=iHigh(NULL,PERIOD_D1,0);
   dl=iLow(NULL,PERIOD_D1,0);
   
   ObjectCreate("LINE1",OBJ_LABEL,0,0,0);
   ObjectSet("LINE1", OBJPROP_XDISTANCE,horizon);
   ObjectSet("LINE1", OBJPROP_YDISTANCE,veritical+lineapart*0); 
   ObjectSet("LINE1", OBJPROP_CORNER,1);                            
   ObjectSetText("LINE1","day amplitude "+DoubleToStr((dh-dl)/Point,0),textfont,"Times New Roman",textcolor);
   
   ObjectCreate("LINE2",OBJ_LABEL,0,0,0);
   ObjectSet("LINE2", OBJPROP_XDISTANCE,horizon);
   ObjectSet("LINE2", OBJPROP_YDISTANCE,veritical+lineapart*1); 
   ObjectSet("LINE2", OBJPROP_CORNER,1);                            
   ObjectSetText("LINE2","from day high "+DoubleToStr((dh-Close[0])/Point,0),textfont,"Times New Roman",textcolor);  
   
   ObjectCreate("LINE3",OBJ_LABEL,0,0,0);
   ObjectSet("LINE3", OBJPROP_XDISTANCE,horizon);
   ObjectSet("LINE3", OBJPROP_YDISTANCE,veritical+lineapart*2); 
   ObjectSet("LINE3", OBJPROP_CORNER,1);                            
   ObjectSetText("LINE3","from day low "+DoubleToStr((Close[0]-dl)/Point,0),textfont,"Times New Roman",textcolor);
   
   
   
       
   
   ObjectCreate("remind1",OBJ_LABEL,0,0,0);
   ObjectSet("remind1", OBJPROP_XDISTANCE,0);
   ObjectSet("remind1", OBJPROP_YDISTANCE,20);
   
   
 ObjectCreate("tpl",OBJ_LABEL,0,0,0);   
 
 
          
   if(allowsound) ObjectSetText("remind1",
        "Sound is on",12,"Times New Roman",Gray);
   if(!allowsound) ObjectSetText("remind1",
        "Mute",12,"Times New Roman",Gray); 
   
   for (j=0; j<i; j++)
    {if(StringSubstr(ObjectName(j),0,2)==linename && ObjectType(ObjectName(j))==OBJ_TREND) 
       { 
         yjx=1; 
         price1=NormalizeDouble(ObjectGetValueByShift(ObjectName(j),1),
                 MarketInfo(Symbol(),MODE_DIGITS)); 
                 
         if (TimeCurrent()-PrevAlertTime>timegap*60)
           {
            
            if (Close[1]<=price1 && Close[0]>price1) 
              { if(allowsound) PlaySound("alert.wav"); 
                if(allowalertwindow) Alert(Symbol(),"--- UP");   
                Print(Symbol(),"--- UP");
                PrevAlertTime = TimeCurrent();     

                ObjectSet("tpl", OBJPROP_XDISTANCE,10);
                ObjectSet("tpl", OBJPROP_YDISTANCE,20); 
                ObjectSet("tpl", OBJPROP_CORNER,3);                        
                ObjectSetText("tpl","THIS CHART BREAKUP",16,"Times New Roman",Red);
              }
            if (Close[1]>=price1 && Close[0]<price1) 
              { if(allowsound) PlaySound("alert.wav");
                if(allowalertwindow) Alert(Symbol(),"--- DOWN");
                Print(Symbol(),"--- DOWN"); 
                PrevAlertTime = TimeCurrent();
                
                ObjectSet("tpl", OBJPROP_XDISTANCE,10);
                ObjectSet("tpl", OBJPROP_YDISTANCE,20); 
                ObjectSet("tpl", OBJPROP_CORNER,3);                        
                ObjectSetText("tpl","THIS CHART BREAKDOWN",16,"Times New Roman",Red);                
                
              }
           }
         if (TimeCurrent()-Prevtext>keeptexttime*60)  
           {
              if(ObjectFind("tpl")==0) ObjectDelete("tpl");
              Prevtext = TimeCurrent();
           }
           
           
           
           
       }
     }      
  if (yjx==0) ObjectSetText("remind1",
        "RENAME AT LEAST ONE LINE NAME TO "+linename+"....",12,"Times New Roman",Red);
  return(0);
}




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