population label issue

[beeul25]

I tested sample data for checking if fastStructure correctly works.

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$ python distruct.py -K 3 --input=test/testoutput_simple --output=test/testoutput_simple_distruct.svg

file with population labels is not provided or does not exist ....
creating population labels based on inferred admixture proportions

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After executed distruct.py command, I had that message about population labels.
I don't know if that is correct message and the program correctly work.
I tested my another data set that were two types of data(plink and structure), but I received the same massage with above one.

How I create the picture matched with sample or population label ?