Trouble with some code

FineDinning

So I just downloaded lime and the software associated with it yesterday. In the command terminal for my Mac Book, I attempted to enter the lines:
lime test html5
This yielded the error:
events.js:72
throw er; // Unhandled 'error' event
^
Error: listen EADDRINUSE
at errnoException (net.js:904:11)
at Server._listen2 (net.js:1042:14)
at listen (net.js:1064:10)
at net.js:1146:9
at dns.js:72:18
at process._tickCallback (node.js:419:13)
at Function.Module.runMain (module.js:499:11)
at startup (node.js:119:16)
at node.js:906:3
Anyone know how to fix this?

Gama11

lime test starts a local webserver, EADDRINUSE means that the address is already in use. Usually this happens when there's still another lime test command running elsewhere (in which case http://localhost:3000/ would still respond).