NullPointerException on startup

[appy]

DataCrow throws a critical error when starting up with a stack trace error as follows:

FATAL [main] (DataCrow.java:425) - Severe error occurred while starting Data Crow. The application cannot continue.
java.lang.reflect.InvocationTargetException
    at java.awt.EventQueue.invokeAndWait(EventQueue.java:1042)
    at javax.swing.SwingUtilities.invokeAndWait(SwingUtilities.java:1326)
    at net.datacrow.core.DataCrow.main(DataCrow.java:349)
Caused by: java.lang.NullPointerException
    at net.datacrow.console.menu.MainFrameMenuBar.build(MainFrameMenuBar.java:189)
    at net.datacrow.console.menu.MainFrameMenuBar.<init>(MainFrameMenuBar.java:53)
    at net.datacrow.core.modules.DcModule.getMenuBar(DcModule.java:908)
    at net.datacrow.console.MainFrame.updateMenuBar(MainFrame.java:457)
    at net.datacrow.console.MainFrame.changeModule(MainFrame.java:480)
    at net.datacrow.console.MainFrame.initialize(MainFrame.java:144)
    at net.datacrow.core.DataCrow$1.run(DataCrow.java:355)
    at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:199)
    at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:641)
    at java.awt.EventQueue.access$000(EventQueue.java:84)
    at java.awt.EventQueue$1.run(EventQueue.java:602)
    at java.awt.EventQueue$1.run(EventQueue.java:600)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:87)
    at java.awt.EventQueue.dispatchEvent(EventQueue.java:611)
    at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:269)
    at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:184)
    at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:174)
    at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:169)
    at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:161)
    at java.awt.EventDispatchThread.run(EventDispatchThread.java:122)
java.lang.reflect.InvocationTargetException
    at java.awt.EventQueue.invokeAndWait(EventQueue.java:1042)
    at javax.swing.SwingUtilities.invokeAndWait(SwingUtilities.java:1326)
    at net.datacrow.core.DataCrow.main(DataCrow.java:349)
Caused by: java.lang.NullPointerException
    at net.datacrow.console.menu.MainFrameMenuBar.build(MainFrameMenuBar.java:189)
    at net.datacrow.console.menu.MainFrameMenuBar.<init>(MainFrameMenuBar.java:53)
    at net.datacrow.core.modules.DcModule.getMenuBar(DcModule.java:908)
    at net.datacrow.console.MainFrame.updateMenuBar(MainFrame.java:457)
    at net.datacrow.console.MainFrame.changeModule(MainFrame.java:480)
    at net.datacrow.console.MainFrame.initialize(MainFrame.java:144)
    at net.datacrow.core.DataCrow$1.run(DataCrow.java:355)
    at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:199)
    at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:641)
    at java.awt.EventQueue.access$000(EventQueue.java:84)
    at java.awt.EventQueue$1.run(EventQueue.java:602)
    at java.awt.EventQueue$1.run(EventQueue.java:600)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:87)
    at java.awt.EventQueue.dispatchEvent(EventQueue.java:611)
    at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:269)
    at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:184)
    at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:174)
    at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:169)
    at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:161)
    at java.awt.EventDispatchThread.run(EventDispatchThread.java:122)

I've had no previous problems with Datacrow, however the last time I used Datacrow before this error occurred I noticed that the main menu bar had disappeared.

I am wondering if this has anything to do with the module I have created, although it was working fine.

[appy]

Hmm, I suspect this has something to do with reusing the term 'item' in my custom module, although I'm not sure why it worked to start with. I should've guessed this is a reserved word.

Assuming this is the case, what files do I need to edit in order to not have to re-write the module completely?

Are there any guidelines on what are reserved words?