Demultiplexing fails (QIIME2/2019.4)

Thanks for helping!

Please see the results below:

# packages in environment at /anaconda2/envs/qiime2-2019.4: 
# 
# Name        Version     Build       Channel 
  q2-demux   2019.4.1   py36_0   qiime2/label/r2019.4

``