Hi @irisdianauy. Welcome to the Seqera Community Forum! :wink:

Command line arguments starting with a double dash, --, are pipeline-specific arguments, not Nextflow arguments. For Nextflow arguments, use a single dash.

This should go in configuration files, though, such as nextflow.config, for example

conda.useMamba = true

or inside the conda scope you’re already using over there, for example:

conda {
  enabled = true
  useMamba = true

You can also set conda to use mamba as solver by default. Check this post in the forum for more info on how to do that. It’s much easier with conda.useMamba = true, of course, but maybe you want Mamba for other purposes too :wink: