As a beginner to lite-C, first just open the script in the workshop folder and run it. Don't copy or type parts of the script yourself. You might make typing mistakes and then get error messages, like in your script above that has missing include lines and other mistakes.

Only in the second step you may modify that script and run it again. If you then make a mistake, you will get an error message that tells you in which line the error is. Now it should be not too difficult to find the reason and fix it.