java.lang.AssertionError: cannot switch to silent mode when not running
        at org.netbeans.progress.spi.InternalHandle.toSilent(InternalHandle.java:156)
        at org.netbeans.api.progress.ProgressHandle.suspend(ProgressHandle.java:116)
        at org.netbeans.modules.maven.execute.AbstractOutputHandler$1.run(AbstractOutputHandler.java:88)
        at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:573)
        at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:1005)