Runtime Error 1004 - BeforePrint - Avoid printing if cells are empty - vba

Question

I am trying to create a macro to prevent users from printing a form if they don't fill out all cells. However, I am getting an error message:
Private Sub Workbook_BeforePrint(Cancel As Boolean)
If Application.Sheets("Form").Range("B4,C4,D4,E4,F4,G4,H4,I4,J4,K4,L4,M4,B5,C5,D5,E5,F5,G5,H5,I5,J5,K5,L5,M5,B6,C6,D6,E6,F6,G6,H6,I6,J6,K6,L6,M6,B7,C7,D7,E7,F7,G7,H7,I7,J7,K7,L7,M7,B8,C8,D8,E8,F8,G8,H8,I8,B9,C9,D9,E9,F9,G9,H9,I9,B11,C11,D11,E11,F11,G11,H11,I11,B12,C12,D12,E12,F12,G12,H12,I12,B13,C13,D13,E13,F13,G13,H13,I13,B14,C14,D14,E14,F14,G14,H14,I14,B16,C16,D16,E16,F16,G16,H16,I16,B17,C17,D17,E17,F17,G17,H17,I17").Value = "" Then
Cancel = True
MsgBox "Fill out all the cells"
End If
End Sub
I have another macro for another form that has fewer cells and that one works just fine:
Private Sub Workbook_BeforePrint(Cancel As Boolean)
If Application.Sheets("Form 2").Range("C4,C5,C6,D4,D5,D6,F4,F5,F6,B8,B9,B10,B11,C8,C9,C10,C11,D8,D9,D10,D11,E8,E9,E10,E11,C13,D13,C16,C17,C18,F16,F17,F18,C22,D22").Value = "" Then
Cancel = True
MsgBox "Fill out all the cells"
End If
End Sub
What can I do to solve this problem?

Answer 1

It seems that there is a limit to line length or to how long of a string you can put into a range(). But you can consolidate it like this. Also I think that the return value from a range() with more than one cell is an array so I am not sure if it is valid to compare it to a string like you did.
Try this:
Private Sub Workbook_BeforePrint(Cancel As Boolean)
For Each cell In Application.Sheets("Form").Range("B4:M7,B8:I9,B11:I14,B16:I17")
If cell.Value = "" Then
Cancel = True
MsgBox "Fill out all the cells"
Exit Sub
End If
Next
End Sub