Gradle - Could not find implementation class 'null' for plugin

I'm having fun hacking together a GitHub deployer plugin for Gradle. I just saw this error message. This means that there's a typo in your class name in your META-INF/gradle-plugins/PLUGIN_NAME.properties:


Caused by: org.gradle.api.plugins.PluginInstantiationException: Could not find implementation class 'null' for plugin 'githubDeployer' specified in jar:file:/Users/user/Documents/fun/gradle/gradle-github-deployer/plugin/build/libs/gradle-github-deployer-hack-0.1-SNAPSHOT.jar!/META-INF/gradle-plugins/githubDeployer.properties