Doesn't Gap Evaluation work with "Hamming" metric?

Hello all,

I tried to use Gap Value to evaluate K-means clustering. It returns error

eva = evalclusters(x,'kmeans','gap','distance','hamming','KList',[1:6])

Warning: Clustering reference data into 1 clusters using function 'getKmeansFunc/nested' generated the following error:
Non-binary data cannot be clustered using Hamming distance. 
> In GapEvaluation>GapEvaluation.evalFunXref at 406
  In GapEvaluation>GapEvaluation.getRefLogW at 562
  In GapEvaluation>GapEvaluation.GapEvaluation at 376
  In evalclusters at 172 
Warning: Clustering reference data into 2 clusters using function 'getKmeansFunc/nested' generated the following error:
Non-binary data cannot be clustered using Hamming distance. 
> In GapEvaluation>GapEvaluation.evalFunXref at 406
  In GapEvaluation>GapEvaluation.getRefLogW at 562
  In GapEvaluation>GapEvaluation.GapEvaluation at 376
  In evalclusters at 172

and so on and so forth.

The data is definitely binary, cause I have applied K-means clustering (Hamming distance) successfully to the same data. It just doesn't work, when I evaluated it with Gap statistic. Can you help me out here? Thanks a lot!!

[betty]

I copy my data (37 x 13) here, please tell me, if you get the same warning after running the gap evaluation. Thanks ~~~

1  0  1  0  1  1  1  0  1  1  1  0  0
0  0  1  0  1  1  1  0  0  1  1  0  0
1  0  0  0  1  0  0  1  0  1  0  1  0
0  1  0  1  0  1  1  1  1  1  0  0  1
1  0  0  0  0  1  1  1  0  1  0  1  0
1  0  1  0  0  1  1  0  0  1  0  1  0
1  1  0  1  0  1  1  1  0  1  0  0  1
0  0  0  1  0  0  0  0  0  1  0  0  1
1  0  0  1  1  1  1  1  1  1  0  1  0
1  0  0  1  0  1  0  0  1  0  1  0  0
0  0  0  0  1  1  0  1  0  1  0  1  0
1  0  0  0  0  1  0  1  0  1  0  0  1
0  0  0  0  0  1  0  0  0  1  0  0  1
0  0  0  1  0  1  0  1  1  0  0  0  1
0  0  0  0  1  1  1  0  1  0  0  0  1
0  1  0  1  0  1  0  0  1  1  0  0  1
0  0  1  1  1  1  0  0  0  1  0  1  0
0  0  1  1  1  1  0  0  0  1  0  1  0
0  0  0  0  0  1  0  0  0  1  0  0  1
1  0  0  1  1  1  1  0  0  1  0  0  1
0  0  0  0  0  0  0  0  0  1  0  1  0
1  0  0  0  0  1  0  0  0  1  0  1  0
0  0  0  0  0  1  0  0  0  1  0  1  0
0  0  0  0  1  1  0  0  0  1  0  1  0
0  0  0  0  0  1  1  0  1  1  0  1  0
0  0  0  0  0  1  0  0  0  1  0  1  0
0  0  0  1  1  1  0  0  0  0  0  0  1
0  0  0  1  1  1  1  0  1  1  0  0  1
1  0  0  1  0  0  0  1  1  0  0  0  1
0  0  0  1  0  0  0  0  1  1  0  0  1
0  0  1  1  0  1  0  1  1  1  0  1  0
1  0  0  1  0  1  1  0  0  1  0  0  1
0  0  0  1  0  1  1  0  1  1  0  0  1
1  0  0  1  0  1  0  0  1  1  0  1  0
0  0  1  1  0  0  1  0  0  1  0  0  1
0  0  0  0  1  1  1  0  0  1  0  0  1
0  0  1  1  1  1  1  0  1  0  0  0  1