Hi folks,
Make sure the Spin process engine plugin is activated for the engine that you use. See https://docs.camunda.org/manual/7.7/user-guide/data-formats/configuring-spin-integration/#configuring-the-spin-process-engine-plugin for details.
Cheers,
Thorben
edit: Also do not include the Spin dependencies in your application, if you are using a shared process engine.