[ccp4bb]: MOSFLM error: Zero reciprocal cell volume from orientation matrix

[Karsten Suhre <Karsten.Suhre@igs.cnrs-mrs.fr>]

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Dear all!

when autoindexing an X-ray image with MOSFLM I always obtain the following 
message after selecting a space group:

[ ...]

   3   4    mC   324.97    22.35    78.97    89.4  92.1  89.3   C2
   2   1    aP    22.35    78.97   162.73    92.1  93.2  89.4   P1
   1   0    aP    22.35    78.97   162.73    87.9  86.8  89.4   P1
 No PENALTY LATT     a        b        c     alpha  beta gamma  Possible 
spacegroups

  No symmetry data !!!
The solution and direct beam position will now be refined; reflections which 
deviate by more
than the sigma cutoff from their calculated position will be excluded from the 
refinement.

Refining solution # 4 with P2     (number   3) symmetry imposed

Initial cell (before refinement) is   78.9684   22.3470  162.7342  90.000 
92.108  90.000


 !!! Zero reciprocal cell volume from orientation matrix !!!


..... after which MOSFLM exits.

I would be very grateful for any suggestions.

Kind regards, Karsten.