We used to have a launcher for the game that was much more user-friendly, but it stopped working. As of now, running the game can be a challenge--sorry if you're having problems running it.
Did you read the game's documentation/readme fully? Be sure to have the main folder extracted before trying to open it in Netbeans.
Also, when opening in Netbeans, make sure not to select the cover folder with the date on it. The folder inside it (titled "The Vehicular Epic") is the one that should be opened.
So in summary, in Netbeans, try File > Open Project and find the "The Vehicular Epic" folder that was extracted. Then go to Run > Run Project (the F6 key should also do the same).