I'm receiving an error while trying to run a multi-command window server application. I'm compiling both the Client and Server with the -cp "commons-lang3-3.10.jar" file, but I continue to run into this Exception. I've attached a link to an image of the error. The program runs at first and waits to accept a client connection..., but then when I open a second command window and run my ChatClient, I get the error. I'm currently using an Ubuntu virtual machine.

https://i.stack.imgur.com/zcvOx.jpg

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