Hi,

I am currently trying to port one of our pipelines to DSL2 but fail to do so due to an issue with the output routing which is beyond my comprehension.
In particular I have some fastq files which I'd like to trim with trim_galore for which reason I coded the following module:

process TRIM_GALORE {

    tag "$meta.id"

    input:
    tuple val(meta), path(reads)

    output:
    tuple val(meta), path("*_trimmed_val_*.fq.gz"), emit: reads
    path "*fastqc.{zip,html}",                      emit: fastqc
    path "*trimming_report.txt",                    emit: reports

    shell:
    read1       = reads[0]
    read2       = reads[1]
    lastPath    = read1.lastIndexOf(File.separator)
    read1Base   = read1.substring(lastPath+1)
    lastPath    = read2.lastIndexOf(File.separator)
    read2Base   = read2.substring(lastPath+1)

    '''
    trim_galore --paired \
                --quality 20 \
                --fastqc \
                --illumina \
                --gzip \
                --output_dir !{meta.id} \
                --basename !{meta.id}_trimmed \
                --cores !{task.cpus} \
                !{read1} \
                !{read2}

    mv !{read1Base}_trimming_report.txt !{meta.id}_trimmed_val_1.fq.gz_trimming_report.txt
    sed -i 's/Command line parameters:.*\$/Command line parameters: !{meta.id}_trimmed_val_1/g' !{meta.id}_trimmed_val_1.fq.gz_trimming_report.txt
    mv !{read2Base}_trimming_report.txt !{meta.id}_trimmed_val_2.fq.gz_trimming_report.txt
    sed -i 's/Command line parameters:.*\$/Command line parameters: ${meta.id}_trimmed_val_2/g' !{meta.id}_trimmed_val_2.fq.gz_trimming_report.txt
    '''
}

The corresponding workflow composition looks like something like this:

    // read QC
    TRIM_GALORE ( ch_cat_fastq )

    // splitting fastqs for HICUP parallelization
    SPLIT_FASTQ ( TRIM_GALORE.out.reads )

However, regardless of what I do I keep getting a No such variable: Exception evaluating property 'out' for nextflow.script.ChannelOut error. If I remove the out. I just get No such variable: reads

I couldn't find anything regarding this on the internet. Does anyone have a clue?