[exec] 13:09:58,655 ERROR [main][FragmentCollectionContributorTrackerImpl:235] Unable to validate fragment entry
[exec] com.liferay.fragment.exception.FragmentEntryContentException: There is no widget available for alias nav.
[exec] at com.liferay.fragment.entry.processor.portlet.PortletFragmentEntryProcessor.validateFragmentEntryHTML(PortletFragmentEntryProcessor.java:263)
[exec] at com.liferay.fragment.internal.processor.FragmentEntryProcessorRegistryImpl.validateFragmentEntryHTML(FragmentEntryProcessorRegistryImpl.java:151)
[exec] at com.liferay.fragment.internal.contributor.FragmentCollectionContributorTrackerImpl._validateFragmentEntry(FragmentCollectionContributorTrackerImpl.java:229)
[exec] at com.liferay.fragment.internal.contributor.FragmentCollectionContributorTrackerImpl._getFragmentEntries(FragmentCollectionContributorTrackerImpl.java:193)
[exec] at com.liferay.fragment.internal.contributor.FragmentCollectionContributorTrackerImpl.access$000(FragmentCollectionContributorTrackerImpl.java:59)
[exec] at com.liferay.fragment.internal.contributor.FragmentCollectionContributorTrackerImpl$FragmentCollectionContributorTrackerServiceTrackerCustomizer.addingService(FragmentCollectionContributorTrackerImpl.java:274)
[exec] at com.liferay.fragment.internal.contributor.FragmentCollectionContributorTrackerImpl$FragmentCollectionContributorTrackerServiceTrackerCustomizer.addingService(FragmentCollectionContributorTrackerImpl.java:257)
[exec] at com.liferay.osgi.service.tracker.collections.internal.map.ServiceTrackerMapImpl$DefaultEmitter.emit(ServiceTrackerMapImpl.java:185)
[exec] at com.liferay.fragment.internal.contributor.FragmentCollectionContributorTrackerImpl.lambda$activate$4(FragmentCollectionContributorTrackerImpl.java:162)
[exec] at com.liferay.osgi.service.tracker.collections.internal.map.ServiceTrackerMapImpl$ServiceReferenceServiceTrackerCustomizer.addingService(ServiceTrackerMapImpl.java:241)
[exec] at com.liferay.osgi.service.tracker.collections.internal.map.ServiceTrackerMapImpl$ServiceReferenceServiceTrackerCustomizer.addingService(ServiceTrackerMapImpl.java:229)
[exec] at org.osgi.util.tracker.ServiceTracker$Tracked.customizerAdding(ServiceTracker.java:943)
[exec] at org.osgi.util.tracker.ServiceTracker$Tracked.customizerAdding(ServiceTracker.java:1)
[exec] at org.osgi.util.tracker.AbstractTracked.trackAdding(AbstractTracked.java:256)
[exec] at org.osgi.util.tracker.AbstractTracked.track(AbstractTracked.java:229)