ErrorFailed to perform normalization!

Dear Developers,
A huge thanks to all your effort in helping we scientists to have such a very helpful platform to analyse our data in a very quick manner.
I have uploaded my files and checked through my taxonomy files and did not see any obvious error, but I get the following error when I try to normalize my data.
I would appreciate your assistance in this issue.

Thanks a lot in advance for your time.
Microbiome analyst metadata.csv (394 Bytes)
Microbiome analyst OTU.csv (6.2 KB)
Taxonomy_microbiome analyst .csv (8.9 KB)