And here is the command that I ran:
% qiime dada2 denoise-single
--i-demultiplexed-seqs single-end-demux.qza
--p-trunc-len 0
--p-trunc-q 25
--verbose
--o-table table.qza
--o-representative-sequences rep-seqs.qza
--o-denoising-stats denoising-stats.qza
I am putting down here all other info in case this will help define the problem
The data is from NCBI bioprojects and it's 16S rRNA microbiome data.
The machine is a Mac with a processor of 2.9 GHz Dual-Core Intel Core i7 and a memory of 2.9 GHz Dual-Core Intel Core i7
It is a known issue for Macs. png.dylib depends on linpng and conda installation runs into the conflict with brew installation.
Check your version using: brew versions libpng
And install the newer one using: brew update libpng