an invalid argument was encountered

I created a report in Crystal XI, and whenever I save it, I get an error saying "an invalid argument was encountered". As is often the case with Crystal error messages, I could not find this error message when searching Help or the Business Objects web site. But this time even Google could not find the message. Does anyone know what it means and what could cause it?

The report only has a single simple formula: formula = {Product.Name} + CStr({Product.ProductId})
It only has one group, which uses the above formula. I was getting this error before putting any data on the report. No subreports, record selection formulas, or parameters yet.

Thanks for any advice.
fundsfAsked:
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GhostModConnect With a Mentor Commented:
Closed, 125 points refunded.
GhostMod
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mlmccCommented:
What type is ProductId?

Try using & instead of +

mlmcc
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SpykairCommented:
Instead of using a formula field, drag a text field onto your rpt. Drag {Product.Name} and {Product.ProductId} into it.

Spykair
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fundsfAuthor Commented:
I added another table to the report, not to fix the problem, but because I needed it, and then the error message stopped occurring. I still don't know the cause, but it seems to be related to the tables selected via the Database Expert. Another important fact I left out is that I'm using an XSD file and the connection type is "ADO.NET (XML)".

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