getting error:Loop variable must be of type SObject at line 9 column 16

[Irish@acc]

public class UpdateTask{ public static Boolean stopDup = false;

public void insertRootCause(List<Task__c> lstTask)

{

set<Id> Ids=new set<Id>();

map<id,id> mapparent=new map<id,id>();

//for(Task__c tsk:trigger.new)

{ //ids.add(tsk.Project__c);}

for(project__c prj: trigger.new) // getting error here..please help as why this error is comimg..I'm trying to get parent's field value here which will be paste in the child of this object

{

mapParent.put(prj.id, prj.Dev_Lead_User__c);

}

if(!stopDup){

List<Root_cause__c> lstRC=new List<Root_Cause__c>();

               for(Task__c t:lstTask){

        // Project__c project = prj.get(t.project__c);

          Root_Cause__c RCDel= new Root_Cause__c();

           System.debug('Im Inside 123----->'+t); 

           RCDel.TaskName__c=t.Id;  

           system.debug(t.TQL_Phase__c=='6.Launch'); 

                      RCDel.Date__c=System.Today();

            RCDel.Launch_Date_Delay__c=0;    

         RCDel.Task_Delay__c=0;         

    RCDel.Dev_Lead__c= mapParent.get(t.Project__c);           

               lstRC.add(RCDel);       

                  }       

if(lstRC.size()>0){

    insert lstRC;   

  stopDup = true;    

}    

  }  

   }  

  }

[bob_buzzard]

You can't use trigger.new as you aren't in a trigger, you are in an instance of a class.  

If this method is being called from a trigger you'll need to pass trigger.new as a parameter to the method.

[Irish@acc]

Hi bob
thanks for the reply..i have modified my code and it looks something like this now..

public class UpdateTask{
public static Boolean stopDup = false;

public void insertRootCause(List<Task__c> lstTask){

List<project__c> lstprj=new List<project__C>();
set<Id> Ids=new set<Id>();
map<id,id> mapparent=new map<id,id>();
for(Task__c tsk:lsttask){
ids.add(tsk.Project__c);}

lstprj=[select id,Dev_Lead_User__c from project__c where id in :Ids];

map<Id,Project__c> map1=new map<id,project__c>();

for(Task__c t:lsttask){
mapparent.put(t.project__c,t.id);}

for(project__c prj:lstprj){
map1.put(prj.id,prj);
}



if(!stopDup){
List<Root_cause__c> lstRC=new List<Root_Cause__c>();


for(Task__c t:lstTask){



// Project__c project = prj.get(t.project__c);
Root_Cause__c RCDel= new Root_Cause__c();

System.debug('Im Inside 123----->'+t);
RCDel.TaskName__c=t.Id;
system.debug(t.TQL_Phase__c=='6.Launch');
RCDel.Date__c=System.Today();
RCDel.Launch_Date_Delay__c=0;
system.debug(RcDEl.Launch_Date_Delay__c==0);
RCDel.Task_Delay__c=0;

RCDel.Dev_Lead__c= map1.get(mapparent.get(t.id)).Dev_Lead_user__c;


lstRC.add(RCDel);

}
if(lstRC.size()>0){
insert lstRC;
stopDup = true;
}
}
}


}

[Irish@acc]

I'm trying to pull out the grand parent field's value and assigning it to grand child object..but gettign an error saying attempt to derefnce null object..plz help

[bob_buzzard]

Where is the null pointer exception - the stack trace should have given you a line number.