You must've made a mistake somewhere then! Either in the manifest, or in attaching the OSBot jar. You can test where the error is by seeing if the skeleton code that I provided shows up when compiled. If it shows up, then your error is in your manifest (or elsewhere in the source). If it doesn't show up, then you've probably attached the jar incorrectly?
Does your script have any errors/red underlines when you compile it? This is important, as if there is even one error, the script will fail compilation.
Also, keep in mind that compilation is not a perfectly reversible process, i.e if you decompile then recompile a script, you are not guarenteed to get back to the perfect original source code.
-Apa