java.lang.AssertionError: Cache directory /Users/okq550/Library/Caches/NetBeans/8.1beta/catalogcache must exist.
   at org.netbeans.modules.autoupdate.updateprovider.AutoupdateCatalogCache.getCatalogCache(AutoupdateCatalogCache.java:89)
   at org.netbeans.modules.autoupdate.updateprovider.AutoupdateCatalogCache.getCatalogURL(AutoupdateCatalogCache.java:110)
   at org.netbeans.modules.autoupdate.updateprovider.AutoupdateCatalogProvider.getUpdateItems(AutoupdateCatalogProvider.java:135)
   at org.netbeans.modules.autoupdate.services.UpdateUnitFactory.appendUpdateItems(UpdateUnitFactory.java:173)
   at org.netbeans.modules.autoupdate.services.UpdateUnitFactory.getUpdateUnits(UpdateUnitFactory.java:143)
   at org.netbeans.modules.autoupdate.services.UpdateManagerImpl$Cache.<init>(UpdateManagerImpl.java:271)
   at org.netbeans.modules.autoupdate.services.UpdateManagerImpl.getCache(UpdateManagerImpl.java:231)
   at org.netbeans.modules.autoupdate.services.UpdateManagerImpl.getUpdateUnits(UpdateManagerImpl.java:100)
   at org.netbeans.api.autoupdate.UpdateManager.getUpdateUnits(UpdateManager.java:103)
   at org.netbeans.modules.ide.ergonomics.fod.FindComponentModules.findComponentModules(FindComponentModules.java:203)
   at org.netbeans.modules.ide.ergonomics.fod.FindComponentModules.access$000(FindComponentModules.java:72)
   at org.netbeans.modules.ide.ergonomics.fod.FindComponentModules$2.run(FindComponentModules.java:197)
Caused: org.openide.util.RequestProcessor$SlowItem: task failed due to: java.lang.AssertionError: Cache directory /Users/okq550/Library/Caches/NetBeans/8.1beta/catalogcache must exist.
   at org.openide.util.RequestProcessor.post(RequestProcessor.java:420)
   at org.netbeans.modules.ide.ergonomics.fod.FindComponentModules.<init>(FindComponentModules.java:96)
   at org.netbeans.modules.ide.ergonomics.fod.ModulesInstaller.installModules(ModulesInstaller.java:114)
   at org.netbeans.modules.ide.ergonomics.fod.ConfigurationPanel.run(ConfigurationPanel.java:195)
   at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1443)
   at org.netbeans.modules.openide.util.GlobalLookup.execute(GlobalLookup.java:68)
   at org.openide.util.lookup.Lookups.executeWith(Lookups.java:303)
   at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:2058)