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Q2A version: 1.81
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You didn't give any information but I guess you are talking about the schema.org structured data.
What theme are you using?

This may answer you: https://www.question2answer.org/qa/70061/schema-org-errors-mainentity-missing
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i using donut theme sir
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In that case, the thread I linked will solve your issue :)
I just added another answer in regards to the Donut theme.
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