Problem starting Selenium Server RC

use a different port number like this if you get an error as mentioned below in image:
c:\>java -jar selenium-server-standalone-2.19.0.jar -port 5561

Do not forget to change the new port number in your code in java or visual studio c#

selenium = new DefaultSelenium("localhost", 5561, "*chrome", "http://172.21.1.60/");