Hi All,

I am trying to deploy changes to Apex Classes in production org via sandbox using change sets.

But upon hitting validate button or test run, I am getting the following error-

System.ListException: List index out of bounds: 0, Stack Trace-Class.DeleteRWClient.DelRecs: line 79, column 1

I haven't got  clue about Apex Classes, the below codes were developed by someone else which unfortunately has errors and I am trying to fix it with your assistance. Can anyone guide me with this please, it would be a massive help.. 

public class DeleteRWClient
{
private string mstrSource;
public string mstrClientID;
private string mstrURL ;
public string mstrNoDel = '';
public string mstrClientName;
List<Opportunity> objListOppor = null;
List<RW_Client_Contact__c> objCM = null;

public DeleteRWClient(ApexPages.StandardController controller)
{
mstrClientID = ApexPages.currentPage().getParameters().get('ClientID');
List<RWClientMaster__c> objRWM = [SELECT NAME FROM RWClientMaster__c WHERE ID = : mstrClientID];
if(objRWM.size() !=0)
{
mstrClientName = objRWM[0].Name;
}
if(ApexPages.currentPage().getParameters().get('source') == null)
{
SourcePage='/apex/RWClientMaster?id=' + mstrClientID + '&sfdc.override=1&emessage=You cannot delete the Client, as it has associated Accounts and Contacts to it';
}
else
{
if(ApexPages.currentPage().getParameters().get('ContactID') != null)
{
objListOppor = [SELECT o.Contact__c From Opportunity o
WHERE o.Contact__c =: ApexPages.currentPage().getParameters().get('ContactID') ];
if(objListOppor .size() !=0)
{
mstrNoDel += 'You cannot delete the Contact, as it has associated Appointments set with this Contact Already';
}
else
{

mstrNoDel += 'Contact is no more associated with RWClient' + ' ' + mstrClientName;
}
}
else
{
mstrNoDel += 'You cannot delete the Client, as it has associated Accounts and Contacts to it';
}

SourcePage= ApexPages.currentPage().getParameters().get('source') + '&emessage=' + mstrNoDel;
}


}

public String SourcePage
{
get{return mstrSource;}
set{mstrSource = value;}
}


public DeleteRWClient()
{

}
public PageReference DeleteRec()
{
//return null;

objCM = [Select ID, r.ContactID__c From RW_Client_Contact__c r
WHERE r.ContactID__c =: ApexPages.currentPage().getParameters().get('ContactID')
AND r.RW_Client_Master__r.ID =:mstrClientID];
delete objCM ;
return new PageReference(SourcePage);
}
static testMethod void DelRecs()
{
List<RWClientMaster__c> objLstCl = [SELECT ID FROM RWClientMaster__c ORDER BY CREATEDDATE DESC LIMIT 1];
ApexPages.currentPage().getParameters().put('ClientID',objLstCl[0].ID );
ApexPages.currentPage().getParameters().put('source','');
List<RW_Client_Contact__c> objClCont = [Select r.ContactID__c, r.RW_Client_Master__c from RW_Client_Contact__c r
WHERE RW_Client_Master__c =:objLstCl[0].ID LIMIT 1];
ApexPages.currentPage().getParameters().put('ContactID',objClCont[0].ContactID__c);
ApexPages.StandardController controller;
DeleteRWClient objDw = new DeleteRWClient(controller);
DeleteRWClient objDw1 = new DeleteRWClient();

objDW.SourcePage = ApexPages.currentPage().getParameters().get('source');
objDW.mstrClientID = ApexPages.currentPage().getParameters().get('ClientID');

string strPage = objDW.DeleteRec().getUrl();

ApexPages.currentPage().getParameters().put('ClientID',objLstCl[0].ID );
ApexPages.currentPage().getParameters().put('source','rc');
ApexPages.currentPage().getParameters().put('ContactID',objClCont[0].ContactID__c);

objDw = new DeleteRWClient(controller);
objDw1 = new DeleteRWClient();

objDW.SourcePage = ApexPages.currentPage().getParameters().get('source');
objDW.mstrClientID = ApexPages.currentPage().getParameters().get('ClientID');

strPage = objDW.DeleteRec().getUrl();

}

}

Regards,

Swapnil