Sunrise desktop (or java.lang.NullPointerException)

amy

I'm trying to run sunrise-desktop on ubuntu, but it gives me the next error when I try to execute sunrise-desktop.sh:

java.lang.NullPointerException  at com.distantchord.sunrise.apps.Desktop.getDocumenta  tionPath(Unknown Source)  at com.distantchord.sunrise.ui.MainWindow$HelpContent  sAction.lt;initgt;(Unknown Source)  at com.distantchord.sunrise.ui.MainWindow.lt;initgt;(Unkn  own Source)  at com.distantchord.sunrise.apps.Desktop.run(Unknown Source)  at com.distantchord.sunrise.apps.Desktop.main(Unknown Source)

What am I missing for it to run?

The text of sunrise-desktop.sh is the following:Code:
java -Xmx128m -Djava.library.path=. -jar sunrise-desktop.jar