Checkbox - Date

I have a Module on a worksheet that when I click on a checkbox it puts the date into the cell directly to the right of the checkbox. Works great... I now want that Module in a new workbook.

I export the module to my desktop (Module1.bas)
Copy a checkbox
Close the workbook
Open the new workbook
Paste the checkbox
Import the module
Right click on the checkbox and Assign the Macro from THIS workbook.

Now when I click it I get a compile error... "Compile Error - Can't find project or library" - the debugger is open and Sub Process_Checkbox() is highlighted in yellow and LNAME is grey... What did I miss? I must be tired...

My code is here:

Sub Process_CheckBox()

Dim cBox As CheckBox
Dim LCol As Long
Dim LRow As Long
Dim Rng As Range

LName = Application.Caller
Set cBox = ActiveSheet.CheckBoxes(LName)

'Find row that checkbox resides in
LCol = cBox.TopLeftCell.Column
LRow = cBox.TopLeftCell.Row
Set Rng = ActiveSheet.Cells(LRow + 1, LCol + 1)

'Change date in cell to the right of CheckBox, if checkbox is checked
If cBox.Value > 0 Then
Rng.Value = Date

'Clear date in column B, if checkbox is unchecked
Else
Rng.ClearContents
End If

End Sub

I tried a few things on this... I opened a new workbook, imported the .bas file to create the module, copied my worksheet from the workbook that it is NOT working in and pasted it into this new workbook. I linked the macro and IT WORKED!!!

What I need to figure out is why it will NOT work on a worksheet in the original workbook. I must have a setting or missing module or something that is preventing it from functioning.