I found that my xlsx file was not reading in the data with row 1 as the column headers. I changed the open statement to the below, and then the code worked without error
dt_WorkingPath = Open( WorkingPath_Settings_File, invisible,
Worksheets( "Sheet1" ),
Use for all sheets( 1 ),
Concatenate Worksheets( 0 ),
Create Concatenation Column( 0 ),
Worksheet Settings(
1,
Has Column Headers( 1 ),
Number of Rows in Headers( 1 ),
Headers Start on Row( 1 ),
Data Starts on Row( 2 ),
Data Starts on Column( 1 ),
Data Ends on Row( 0 ),
Data Ends on Column( 0 ),
Replicated Spanned Rows( 1 ),
Replicated Spanned Headers( 0 ),
Suppress Hidden Rows( 1 ),
Suppress Hidden Columns( 1 ),
Suppress Empty Columns( 1 ),
Treat as Hierarchy( 0 ),
Multiple Series Stack( 0 ),
Import Cell Colors( 0 ),
Limit Column Detect( 0 ),
Column Separator String( "-" )
) );
Jim