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Looks like you are missing some parts. See the API doc for the class: UnsatisfiedLinkError

I'm not familiar with lwjgl. Read its API doc to see where you need to place the parts it uses during...

You need to be in the folder with the jar file. Change the directory or copy the jar file to the Greg folder.
The java command did not find the jar file.

See if there are error messages:
Open a command prompt window and entry:
java -jar THEJARFILENAME.jar

copy the full contents of the window and paste here.

On windows: To copy the contents of...