[flinkx on k8s][web-ui]Unable to load requested file /index.html

[geosmart]

flink version: 1.12.2

the flinkx sync job is stated in k8s, but the web ui open with error

11:28:42.262 [main] INFO org.apache.flink.runtime.jobmaster.MiniDispatcherRestEndpoint - Web frontend listening at http://kafka-hdfs-parquet:8081.

kubectl -n flinkx port-forward kafka-hdfs-parquet-7f7d87d684-rqfrh 8081:8081

when i visit http://localhost:8081/ ,I get the error

{
    "errors": [
        "Unable to load requested file /index.html."
    ]
}

flink doc:accessing-flinks-web-ui

anyone knows why this happen, and how to resolve it

[geosmart]

just manualy add flink-runtime-web_2.12.jar to the flink/lib path, and everything is ok.