MavenPublication and its parameters cannot be resolved

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1

I have a master directory build.gradle, and a module with another build.gradle that I’m trying to set up to publish to a maven repo. It cannot build, giving an error of Cause: invalid type code: B3 , ultimately because of org.gradle.internal.metaobject.AbstractDynamicObject$CustomMessageMissingMethodException on one of the parameters within the MavenPublication I’m trying to define.

If I view it in IntelliJ Idea, I can see that the parameters of the MavenPublication I’m trying to define are all marked as unresolved references.

Master directory build.gradle:

buildscript {

    repositories {
        mavenLocal()
        mavenCentral()
        maven { url "https://plugins.gradle.org/m2/" }
        maven { url "https://oss.sonatype.org/content/repositories/snapshots/" }
        jcenter()
    }
    dependencies {

    }
}

allprojects {
    apply plugin: "idea"

    group = 'com.mygroup'
    version = '1.0.0'

    repositories {
        mavenLocal()
        mavenCentral()
        jcenter()
        maven { url "https://oss.sonatype.org/content/repositories/snapshots/" }
        maven { url "https://oss.sonatype.org/content/repositories/releases/" }
    }
}

And here’s the module’s build.gradle.

plugins {
    id 'java-library'
    id 'maven-publish'
    id 'signing'
}

task sourcesJar(type: Jar) {
    from sourceSets.main.allJava
    archiveClassifier = 'sources'
}

task javadocJar(type: Jar) {
    from javadoc
    archiveClassifier = 'javadoc'
}

publishing {
    publications {
        mavenJava(MavenPublication) {
            artifactId = 'mylibrary'
            from components.java
            artifact sourcesJar
            artifact javadocJar
        }
    }
}

signing {
    sign publishing.publications.mavenJava
}

javadoc {
    if(JavaVersion.current().isJava9Compatible()) {
        options.addBooleanOption('html5', true)
    }
}

Any ideas of where I’ve gone wrong? I’m using Gradle 5.4.1.