I have a declarative pipeline stored in a Jenkinsfile in a multibranch pipeline in GitHub. I can create a new pipeline in Blue Ocean and get a successful run.

However, when I click on the "pencil" icon (second icon from the right - next to the star icon) in the master branch, all I get is a blank screen.

I figured out what provokes this. I have a Jenkinsfile like the one below.

#!groovy
pipeline {
agent

{ label 'worker_node1'}

libraries

{ lib('Utilities2') }

stages {
stage('Source') {
steps

{ checkout scm stash name: 'test-sources', includes: 'api/**, dataaccess/**, util/**, build.gradle, settings.gradle' }

}
stage('Build') {
// Run the gradle build
steps

{ sh 'echo hi' gbuild '-x test build' }

}
}
}

The gbuild call is a function defined in the 'Utilities2' lib that I pull in the libraries section. As soon as I add any call to any function in a library that I include, I get the blank screen. Without that call, I can edit it. (And by the way, this code works fine when executing the pipeline.)

The debugger in the browser flags this:

unreachable code after return statement[Learn More] jenkins-js-extension.js:10890:12