[GRASS-user] i.gensigset error

[fujihirakei at yahoo.co.jp]

I'm trying to make supervised land use classification map by using i.smap program.
So I run i.gensigset to make statistics for i.smap.

But I had errors:
------------------------------------------------
 > i.gensigset trainingmap=GT group=test sub=test signaturefile=sig

Finding training classes...
 100%
4 classes found
Reading raster maps...
 100%
Clustering class 1 (396 pixels)...
WARNING: Removed a singular subsignature number 1 (9 remain)
WARNING: Removed a singular subsignature number 1 (8 remain)
WARNING: Removed a singular subsignature number 1 (7 remain)
WARNING: Removed a singular subsignature number 1 (6 remain)
WARNING: Removed a singular subsignature number 1 (5 remain)
WARNING: Removed a singular subsignature number 1 (4 remain)
WARNING: Removed a singular subsignature number 1 (3 remain)
WARNING: Removed a singular subsignature number 1 (2 remain)
WARNING: Removed a singular subsignature number 1 (1 remain)
WARNING: Unreliable clustering. Try a smaller initial number of clusters
WARNING: Removed a singular subsignature number 1 (-1 remain)
WARNING: Unreliable clustering. Try a smaller initial number of clusters
Number of subclasses is 0
Clustering class 2 (36 pixels)...
WARNING: Too many subclasses for class index 2
Number of subclasses set to 4
WARNING: Removed a singular subsignature number 1 (3 remain)
WARNING: Removed a singular subsignature number 1 (2 remain)
WARNING: Removed a singular subsignature number 1 (1 remain)
WARNING: Unreliable clustering. Try a smaller initial number of clusters
WARNING: Removed a singular subsignature number 1 (-1 remain)
WARNING: Unreliable clustering. Try a smaller initial number of clusters
Number of subclasses is 0
Clustering class 3 (99 pixels)...
WARNING: Removed a singular subsignature number 1 (9 remain)
WARNING: Removed a singular subsignature number 1 (8 remain)
WARNING: Removed a singular subsignature number 1 (7 remain)
WARNING: Removed a singular subsignature number 1 (6 remain)
WARNING: Removed a singular subsignature number 1 (5 remain)
WARNING: Removed a singular subsignature number 1 (4 remain)
WARNING: Removed a singular subsignature number 1 (3 remain)
WARNING: Removed a singular subsignature number 1 (2 remain)
WARNING: Removed a singular subsignature number 1 (1 remain)
WARNING: Unreliable clustering. Try a smaller initial number of clusters
WARNING: Removed a singular subsignature number 1 (-1 remain)
WARNING: Unreliable clustering. Try a smaller initial number of clusters
Number of subclasses is 0
Clustering class 4 (9 pixels)...
WARNING: Not enough pixels in class 4
Number of subclasses is 0
i.gensigset complete.
----------------------------

I tried to solve the errors:
1. Changed null data to 0.
2. Enlarge training area 

But I can't solve the errros.
Why I had these errors? What should I do to solve the errors?
Thanks

Kei
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