I’m running the rnaseq pipeline with test data and I notice this in the logs

Process NFCORE_RNASEQ:RNASEQ:FASTQ_FASTQC_UMITOOLS_TRIMGALORE:TRIMGALORE > Skipping output binding because one or more optional files are missing: fileoutparam<2:1>

Does anyone know if this is an error or if this is supposed to be the case? Does the test data not utilize this process? The pipeline will still complete successfully and generate a multiqc report regardless

I'm not sure what exactly that particular message refers to, but some processes can under some circumstances (but not others) produce optional files, and this informational message tells you that those were not produced here. Feel free to ignore it. A lot of the messages are there, because they are useful for debugging, but if everything is as you expected, they can be ignored.