I'm getting this error a few thousand steps into a CosmoMC run and am not sure what it means.
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Reionization_zreFromOptDepth: Did not converge to optical depth
tau = 0.103192158035086 optical_depth = 0.116118419386404
50.0000000000000 49.9984741210938
(If running a chain, have you put a constraint on tau?)
MpiStop: 5
application called MPI_Abort(MPI_COMM_WORLD, 0) - process 5
I have these lines in my .ini file:
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param[tau] = 0.07 0.01 0.15 0.02 0.02
prior[tau] = 0.07 0.02
In my fit I don't have any primary CMB data (no TT/TE/EE measurements), however I do have the Planck 2015 CMB lensing phi-phi power spectrum, and am allowing some freedom in tau because I noticed it made some difference to this likelihood. I see tau is fixed in batch2/lensonly.ini, so I will rerun with fixed tau to see if that helps. But what's the reason this error comes up?