I want to do microbiome analysis using R, for which I have three folders that contain ASV data, metadata i.e. sample data, and taxonomy data for 56 sample studies. I want to read the data in those folders and create a separate phyloseq object for each sample study, then I have to make a merged phyloseq object. The issue I am facing is that while creating a phyloseq object the ASV table is said to be non-numeric. What should I do in such a case?