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Origin: check. Landing-place: diagnose.
Deref-seqop used on undefined statement: R
The Deref sequent operator applied to a sequent 
yields 
where n is the name of a lemma and x is what the lemma says. Alternatively, n may be a theorem, axiom, theory, or whatever that has a statement definition. The 'Deref-seqop used on undefined statement' indicates that n did not denote any statement. The error may indicate an error in the proof or a bug in a tactic.
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