Transaction Groups: Expression Item: A tag executor could not be created for the Item

I'm encountering the same error message in the log when trying to execute a Named Query from a Transaction Group

I think it's then causing my other issues, as seen in the log.

Here are my Transaction settings

All of the VALUE column data are tags selected via the tag browser

Also, if you look at the details for the "ERROR FORWARDING DATA" log, it's complaining about a NULL string write

But tag ShopOrderNumber has a string in it...I've tried with and without "" or '' or no quotes