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Sorry, I don't know anything about netbeans.

What command is being executed to get that error message?

If you are using an IDE, perhaps you should try using the command prompt first to learn what is going on.

Take a look at the tutorial. ...

What command did you execute to get that error message?

There is no main() method in the Task1 class.
The main() method is in the GASBill class.
Is GASBill in a package? If not, To execute...