Exception in thread "main" java.net.BindException: Address already in use

Hi ,
Am new to zookeeper Ui , am trying to just install it my Mac system , I followed the steps which are mentioned but it shows "address already in use" again and again .
I tried changing the port number , still not working .
I verified using netsat command , no other process is running with 9090 .
Has anyone faced this issue ?

The issue mentions a macOS installation of zkUI and a Java BindException on port 9090, but names no repository files, tests, or entry points. Start by reviewing the installation and startup instructions and reproducing the port-binding failure; done requires identifying a repository-side cause or documenting that the issue is environment-specific.

Written by the indexing model from the issue text.