SystemAction.get method not found

I'm loving 8.2!  

After updating my NBP-based project from NB 8.01 to 8.2, everything builds just fine using my main development machine.  However, opening a copy of the project in NB 8.2 on a separate machine gives a series of red-! icons with errors on source code lines calling SystemAction.get, e.g.,


Code:
        actions.add(SystemAction.get(CopyAction.class));




The build log gives details:

Code:
C:\Users\gbullock\Documents\NetBeansProjects\Ionoview\IonogramNodes\src\com\nwra\ionoview\nodes\DataPointNode.java:67: error: cannot find symbol
        actions.add(SystemAction.get(CopyAction.class));
  symbol:   method get(Class<CopyAction>)
  location: class SystemAction
C:\Users\gbullock\Documents\NetBeansProjects\Ionoview\IonogramNodes\src\com\nwra\ionoview\nodes\DataPointNode.java:68: error: cannot find symbol
        actions.add(SystemAction.get(CutAction.class));
  symbol:   method get(Class<CutAction>)
  location: class SystemAction
C:\Users\gbullock\Documents\NetBeansProjects\Ionoview\IonogramNodes\src\com\nwra\ionoview\nodes\DataPointNode.java:69: error: cannot find symbol
        actions.add(DeleteAction.get(DeleteAction.class));
  symbol:   method get(Class<DeleteAction>)
  location: class DeleteAction



Any idea why these lines build just fine on one machine but give errors on another?  

They're both using NB 8.2.  I think all relevant source and project files are present and identical on the two machines, but there's clearly some difference somewhere.  What could it be?