Any idea about what this means or advice on solving this

Factory method wireMockServer' threw exception with message: class org.eclipse.jetty.http2.server.HttpChannelOverHTTP2 has interface org.eclipse.jetty.server.HttpChannel as super class`

Could you give a little more context as to what you are doing? Are you running wiremock stand-alone or using it in tests? Running Spring or a different framework? There are some jetty issues with the latest version of spring boot which we are currently working on but without a little more context it is difficult to tell if that is related to your issue.