In reference to nextflow-io/nf-schema#3
nextflow run main.nf
N E X T F L O W ~ version 23.10.1
Launching `main.nf` [sleepy_agnesi] DSL2 - revision: 5628d149e4
Pipeline is starting! 🚀
ERROR ~ Operator 'goodbye' conflict - it's defined by plugin nf-hello and nf-hello
-- Check script './example.nf' at line: 1 or see '.nextflow.log' file for more details