Hi @JFrench ,
The error indicates just as Ann mentioned in the earlier thread.
What version of SonarQube are you using?
You can use Java 8 to build your sources however to execute analysis with SonarQube 9.X you need to run it with Java 11. This can be done by either making sure that the builds run with Java 11 by default e.g. by making Java 11 the default version on your self-hosted agent or by setting/overriding the JAVA_HOME environment variable in the pipeline right before the analysis is run as we document here.
Joe