Probably because it's not a standard notation.
The standard notation is  P21212.

I would reindex and run again.

Klaus

PhilEvans wrote:
Is there a reason why Arp/warp doesn't like space group P 21 2 21?

Phil



--
Dr. Klaus Piontek
Albert-Ludwigs-University Freiburg
Institute of Organic Chemistry and Biochemistry, Room 401 H Albertstrasse 21 D-79104 Freiburg Germany
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