NullReferenceException: Object variable or With block variable not set.]

Hello all, Can someone please tell me why I'm getting this error? I checked my for loop down below. I thought I allocated memory properly for i and j. What is causing this error? NullReferenceException: Object variable or With block variable not set.]
Microsoft.VisualBasic.CompilerServices.Container..ctor(Object Instance) +248692
Microsoft.VisualBasic.CompilerServices.NewLateBinding.LateIndexSetComplex(Object Instance, Object[] Arguments, String[] ArgumentNames, Boolean OptimisticSet, Boolean RValueBase) +75
Microsoft.VisualBasic.CompilerServices.NewLateBinding.LateIndexSet(Object Instance, Object[] Arguments, String[] ArgumentNames) +13

users_adv_setup_local_update.ftpthefiles(String siteurl, String ledir) +344
users_adv_setup_local_update.btnNext_Click(Object sender, EventArgs e) +1180
System.Web.UI.WebControls.Button.OnClick(EventArgs e) ...