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I can't run lefse tutorial example

I downloaded this example:

After that i run this: hmp_aerobiosis_small.txt -c 1 -s 2 -u 3 -o 1000000

and obtain this error:
Traceback (most recent call last):
File “/home/rodrigo/miniconda3/envs/lefse/bin/”, line 459, in
feats = numerical_values(feats,params[‘norm_v’])
File “/home/rodrigo/miniconda3/envs/lefse/bin/”, line 191, in numerical_values
feats[k] = [float(val) for val in v]
File “/home/rodrigo/miniconda3/envs/lefse/bin/”, line 191, in
feats[k] = [float(val) for val in v]
ValueError: could not convert string to float: ‘skin’

Hi Rodrigo,
Would you mind letting me know how you set the class and subclass variables? I think that might be causing this error.