Error in Present Validation Station

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1

Hi team

I am trying to process invoices using Document Understanding and keeping a machine learning extractor as the extractor. But during the present validation station step, I am getting this error.
I am not able to figure it out.
Can someone please help me by telling me what needs to be done here?

thankyou :slight_smile:

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2

Did you use document classification as well? Do you have only invoices?

3

I don’t know what it means exactly, can you please elaborate