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  1. ,

    Check if there is no nexus running. If not, delete sonatype-work/nexus/nexus.lock .

  2. ,

    checkState() is Static convenience methods that help a method or constructor check whether it was invoked correctly (whether its preconditions have been met). This occurs when the precondition does not met.

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java.lang.IllegalStateException: Light box should never be called twice 	at com.google.common.base.Preconditions.checkState(Preconditions.java:176)	at org.multibit.hd.ui.views.components.Panels.showLightBox(Panels.java:313)	at org.multibit.hd.ui.controllers.MainController.onAboutEvent(MainController.java:777)	at org.multibit.hd.ui.platform.handler.DefaultAboutHandler.handleAbout(DefaultAboutHandler.java:66)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:606)	at org.multibit.hd.ui.platform.builder.mac.BaseMacInvocationHandler.invoke(BaseMacInvocationHandler.java:81)	at com.sun.proxy.$Proxy15.handleAbout(Unknown Source)	at com.apple.eawt._AppEventHandler$_AboutDispatcher.performUsing(_AppEventHandler.java:250)	at com.apple.eawt._AppEventHandler$_AboutDispatcher.performUsing(_AppEventHandler.java:244)	at com.apple.eawt._AppEventHandler$_AppEventDispatcher$1.run(_AppEventHandler.java:516)	at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:312)	at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:745)	at java.awt.EventQueue.access$300(EventQueue.java:103)	at java.awt.EventQueue$3.run(EventQueue.java:706)	at java.awt.EventQueue$3.run(EventQueue.java:704)	at java.security.AccessController.doPrivileged(Native Method)	at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)	at java.awt.EventQueue.dispatchEvent(EventQueue.java:715)	at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:242)	at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:161)	at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:150)	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:146)	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:138)	at java.awt.EventDispatchThread.run(EventDispatchThread.java:91)