Power Report Builder invalid field error?

I have Power Report Builder, I cannot find the version but it was installed in January 2023. I'm new to the Report Builder and know Power BI a bit. I could not find a forum just for Report Builder so I posted here.

I have entered a data source and Dataset. I'm getting invoices from the Invoice table.

When I run the report I get "Failed to preview report. The 'Value' expression for the text box 'jbinvnum' refers to the field 'jbinvnum'. Report item expressions can only refer to fields within the current dataset scope or, if inside an aggregate, the specified dataset scope. Letters in the names of fields must use the correct case.
The definition of the report '' is invalid."

I've done some Google searching to no avail. What does this error mean and how do I fix it? 

My final output is to test what Report Builder outputs when I export the data for one invoice to an XML file. It does not look like PBI Desktop can export to XML, even if the report is on the PBI service/website.

Thank you.