Hi 1. You could check whether the 'org.apache.flink.api.java.clean' is in your classpath first. 2. Do you follow the doc[1] to deploy your local cluster and run some existed examples such as WordCount?
[1] https://ci.apache.org/projects/flink/flink-docs-release-1.10/ops/deployment/cluster_setup.html Best, Guowei
