Calling add-in macro(with variable) gives '1004' error

(XL2007, Vista) I am creating a new worklbook from a template. One of the sheets in the new workbook has a selection of three cells as "buttons". The Worksheet_SelectionChange event is supposed to call a macro in an add-in and pass the Target.Address as a string variable.

I did just have the three cells call three separate macros from the add-in, without passing any variables, and those worked fine. But then it dawned on me that I couldn't add any new functionality in files created on that template because I couldn't get to the VBE to add a call to a new macro. So if I just call a macro in the add-in that figured out what to do based on the Target.Address, then I could update the add-in as needed with new functions.

Now, though, calling the add-in macro gets me a 1004 error:
"Cannont run the macro 'MyAddIn.xlam!doTarget(strAddress)'. The macro may not be available in this workbook, or all macros may be disabled."

This error occurs no matter which cell I select on the sheet. The code stops on the "Application.Run" line.

Any help on fixing this?
Ed

In worksheet:

Private Sub Worksheet_SelectionChange(ByVal Target As Range)
Dim strAddress As String
strAddress = Target.Address
Application.Run "MyAddIn.xlam!doTarget(strAddress)"
End Sub

In add-in:

Sub doTarget(strAddress As String)
Select Case strAddress
  Case "$H$23:$J$24"
    Call doRows
  Case "$H$27:$J$28"
    Call doNames
  Case "$H$31:$J$32"
    Call doFreeze
End Select
End Sub

(Solved) Calling add-in macro(with variable) gives '1004' error

Thanks for the assist. Got it working.

Ed