My code is getting a type mismatch error on one workbook, but not the other.

[Dylan1023]

EDIT: Figured this out, was labeling the .Column with the wrong number!

First off, here is a sample of my codes:

Private Sub PopoutLeadListBox_DblClick(ByVal Cancel As MSForms.ReturnBoolean)
Dim selectedItem As String
selectedItem = Me.PopoutLeadListBox.Column(61)

Set ws = ThisWorkbook.Sheets(Mark1.LEADLISTDROPDOWN.Value)


Mark1.WHYTEXTBOX.Value = Application.XLookup(Val(selectedItem), ws.Range("BI:BI"), ws.Range("CN:CN"))
End Sub

Private Sub PopoutLeadListBox_DblClick(ByVal Cancel As MSForms.ReturnBoolean)
Dim selectedItem As String
selectedItem = Me.PopoutLeadListBox.Column(11)

Set ws = ThisWorkbook.Sheets(SalesForm.BHSDLEADLISTSCOMBOBOXLF.Value)

SalesForm.BHSDTAPNAMELF.Value = Application.XLookup(Val(selectedItem), ws.Range("S:S"), ws.Range("T:T"))

The first code is returning a type mismatch error on this line:

Mark1.WHYTEXTBOX.Value = Application.XLookup(Val(selectedItem), ws.Range("BI:BI"), ws.Range("CN:CN"))

But this isn't a problem for the second. To my knowledge, both of these workbooks are formatted the same, as well. Am I overlooking something?

I'm having a hard time posting a sample workbook of this, so I'm hoping it is something stupid.

Crossposted @ stackoverflow, but don't have permission to post links.