Number of significantly discriminative features: 311 ( 311 ) before internal wilcoxon

Hi!
I meet this error when running LEfSe (http://galaxy.biobakery.org/). Step A) runs well but an error is reported in Step B).

An error occurred with this dataset:
Number of significantly discriminative features: 22 ( 22 ) before internal wilcoxon
Traceback (most recent call last):
File “/galaxy_venv/bin/lefse_run.py”, line 33, in
sys.exit(load_entry_point(‘lefse==1.1.2’, ‘console_scripts’, 'lefse_ru

image
Could you help with this? Thank you for your kind help.
Best regards,
Ruchen