LLREZOBJECT woes!

string EvaluatePostFix(list postFixOutput){
    list deadBoxes = [];    
    list evaluationStack = [];
    list temp = [];
    integer i;
    integer boxesKilled = 0;
    lock = 1;
    for(i=0;i < llGetListLength(postFixOutput); i++){
        llSleep(1);
        string val = llList2String(postFixOutput,i); 
         deadBoxes = deadBoxes + llList2String(keysOfLastBlocks,i);
         
          if(~llListFindList(operators, (list)val)) {
                     integer one = (integer)llList2String(evaluationStack,llGetListLength(evaluationStack)-2);
                     integer two =  (integer)llList2String(evaluationStack,llGetListLength(evaluationStack)-1);
            
                       integer result = 0;
                     if(val == "-")result = one - two;
                     if(val == "+")result = one + two;
                      if(val == "/")result = one / two;
                      if(val == "*")result = one * two;
                    llSay(0,"Popped "+(string)one +","+(string)two+" off eval and operator = "+val+" and result back onto eval is : "+(string)result);
            
                     temp = evaluationStack;
            
                        evaluationStack = [];
            
                       integer p;
                  for(p=0;p < llGetListLength(temp)-2;p++){
                   evaluationStack = evaluationStack + llList2String(temp,p);  
                  }
           
           
                     evaluationStack = evaluationStack + (string)result; 
              
             llSay(888,(string)(llList2String(keysOfLastBlocks,i)+"lala"));
             
             //delete last two and operator output the result as a new box
             integer k;
             key lastVal;
             tempList = [];
             for(k = 0;k< llGetListLength(deadBoxes);k++){
                
                 llSay(6666,llList2String(deadBoxes,k));
                 
                   
                   tempList +="";
               
            boxesKilled++;
                }
                
                //fill in gaps for the items now deleted and add 
                
                integer val = result + 100;
               
                             integer item = (integer)llGetListLength(keysOfLastBlocks);
                             item = item - boxesKilled-1;
                              list params=  llGetObjectDetails(llList2String(keysOfLastBlocks,item),[OBJECT_POS] );
           old = llGetListLength(keysOfLastBlocks);
         llSay(0,"Size of list before is:"+(string)llGetListLength(tempList));
            
             llRezObject("Begin", (vector)llList2String(params,0) - <0, 0, 0.5>, ZERO_VECTOR, ZERO_ROTATION,val);
       
       
        
        
        llSay(0,"Size of list after is:"+(string)llGetListLength(tempList)); 
           integer s; 
           llSay(0,"OTHER MESSAGE BEFORE THIS?!");
           for(s=llGetListLength(tempList);s< llGetListLength(keysOfLastBlocks); s++){
               
             tempList+=llList2String(keysOfLastBlocks,s);  
            }
           keysOfLastBlocks = tempList;
                
                llSay(0,"Boxes killed"+(string)boxesKilled);
             
              integer l;
                
                for(k = boxesKilled;k < llGetListLength(keysOfLastBlocks);k++){
                    llSleep(0.5);
                    for(l=0;l < boxesKilled;l++){
                        llSleep(0.2);    
                     llSay(999,llList2String(keysOfLastBlocks,k));
                   
                        }
                    
                    } 
                
                
            }
            
            else if( (integer)val >= 0){
                evaluationStack = evaluationStack + val;
                 llSay(888,llList2String(keysOfLastBlocks,i));
                
            }
 
      
    }
    list params=  llGetObjectDetails(llList2String(keysOfLastBlocks,0),[OBJECT_POS] );
    integer item = (integer)llList2String(evaluationStack,0);
    item = item + 100;
      llRezObject("Begin", llGetPos() - <0, 0, 0.5>, ZERO_VECTOR, ZERO_ROTATION,item);
    
    return ownerSayStrings(evaluationStack);
    
    
}