Any individual who is refuted then do we declare him an innovator outside of the fold of Ahlus Sunnah?

Is it possible for a Scholar of Sunnah to be refuted for an error or an erroneous position he takes in an issue?

Were there Muhaddiseen or great Scholars in the past who were refuted or criticised for their mistakes?

When is a person labelled as an innovator - what are the conditions for this

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