Re: Alignment error message

this might be a little outdated, but just for the record:
In response to @coralgal’s post regarding an error message when running
qiime alignment mafft --i-sequences rep-seqs.qza --o-alignment aligned-rep-seqs.qza in earlier qiime2 builds.

I came across this same issue/error message while using qiime2-2020.2.
It was solved when I modified the command using the --p-n-threads auto flag:
qiime alignment mafft --i-sequences rep-seqs.qza --o-alignment aligned-rep-seqs.qza --p-n-threads auto

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