I keep getting the error message below. I have changed this option many times
but it never sticks. It has been happening consistently since yesterday.
~/isabelle/Repos/src/HOL: hg id
ec4fe1032b6e tip
Larry
"vampire": Error: The Vampire prover is not activated; to activate it, set the
Isabelle system option "vampire_noncommercial" to "yes" (e.g. via
the Isabelle/jEdit menu Plugin Options / Isabelle / General)
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