Error in packageVersion(“dada2”) : package ‘dada2’ not found

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try this:

$ conda list | grep 'dada2'
bioconductor-dada2        1.10.0           r351h0a44026_0    bioconda
q2-dada2                  2019.4.0                 py36_0    qiime2/label/r2019.4

You must import that library first

> library(dada2)
Loading required package: Rcpp
> packageVersion("dada2")
[1] ‘1.10.0’