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Error using ReadValueList - by: info@software2000.it

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good evening, I'm encountering an error using ReadValueList, in the attached screenshot the exact error that is returned to me by the variable good evening, I'm encountering an error using ReadValueList, in the attached screenshot the exact error that is returned to me by the ErrorMessageBrief variable.
What does it mean? what can I check?
In the meantime, thanks.

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