Hi @anamarija,
I just went over the tutorial again and was successful on some new data clustering at 99% identity asyou did. The only change I had to make was to my mapping file (as mentioned above sample-id -> `#SampleID). Did you by chance use the 99_otus.fasta reference database with the 97% taxonomy? Because that would certainly throw an error, you would have to use matching otus/taxonomy. What % identity you use for clustering shouldn't cause any errors.
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