Skip to content

Missing process or function with name mix

Issue

You get the follow error when using .mix() on channels

Missing process or function with name 'mix'

Possible source

  • You passed a multi-channel output variable to .mix that causes this error:

    ch_scaffolds2bin_for_dastool
    .mix(DASTOOL_SCAFFOLDS2BIN_METABAT2.out.scaffolds2bin)
    .mix(DASTOOL_SCAFFOLDS2BIN_MAXBIN2)

    when you should've specified the particular .out channels

    ch_scaffolds2bin_for_dastool
    .mix(DASTOOL_SCAFFOLDS2BIN_METABAT2.out.scaffolds2bin)
    .mix(DASTOOL_SCAFFOLDS2BIN_MAXBIN2.out.scaffolds2bin)

Recommendation

Use static typing with Nextflow 26.10 or later. A typed process call returns its output directly, so assign it to a variable and pass the variable to mix. nextflow lint reports a process name used as a value:

Error main.nf:16:25: Process `DASTOOL_SCAFFOLDS2BIN_MAXBIN2` cannot be used as a variable

It also reports a mix of channels with different element types.