I have problem with this code:`
Worksheets("IO").Cells(i + 13, 2).Formula = _
"=sum(" & Worksheets("IO").Range(Cells(i + 1, 6), Cells(i + 1, 5 + numjob)).Address & ")"
and other line code that use with sum of range of cell. Sometimes the code is working, but most of the time is not. What i need to fix? I get error 1004 of applications defined or object defined.