[Rasch] warning message in Facet

Parisa Daftari Fard pdaftaryfard at yahoo.com
Sat Aug 20 04:38:30 EST 2011

Dear Listmembers,
I wonder if anyone can help me with this warning message in Facet I receive. I have three facet (rater, question type and items) and I run facet for each question type (four) each time. 
Table 14: There are 0 pairwise terms for 1. Native speakers
Table 14: There are 0 pairwise terms for 3. items
I am not sure what I should do to prevent this. 
I appreciate your help and advice beforehand.
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