Errors from running demo data

Hi, I follow the tutorials here (GitHub - biobakery/biobakery_workflows: bioBakery workflows is a collection of workflows and tasks for executing common microbial community analyses using standardized, validated tools and parameters.)
I run this:
biobakery_workflows wmgx_wmtx --input-metagenome examples/wmgx_wmtx/wms/ --input-metatranscriptome examples/wmgx_wmtx/wts/ --input-mapping examples/wmgx_wmtx/mapping.tsv --output workflow_output

However, I get some errors like this

LoggerReporter task_failed ERROR: task 4, kneaddata____wms_2 : Failed! Error message : Error executing action 0. Original Exception:
Traceback (most recent call last):
File “/usr/local/lib/python3.6/dist-packages/anadama2/runners.py”, line 201, in _run_task_locally
action_func(task)
File “/usr/local/lib/python3.6/dist-packages/anadama2/helpers.py”, line 89, in actually_sh
ret = _sh(s, **kwargs)
File “/usr/local/lib/python3.6/dist-packages/anadama2/util/init.py”, line 320, in sh
raise ShellException(proc.returncode, msg.format(cmd, ret[0], ret[1]))

Is this my installation problem or I didn’t run correct script