java.io.IOException: Not in GZIP format

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java.io.IOException: Not in GZIP format
at java.util.zip.GZIPInputStream.readHeader(GZIPInputStream.java:137)
at java.util.zip.GZIPInputStream.(GZIPInputStream.java:58)
at java.util.zip.GZIPInputStream.(GZIPInputStream.java:68)
at org.netbeans.modules.autoupdate.updateprovider.AutoupdateCatalogParser.getInputSource(AutoupdateCatalogParser.java:176)
at org.netbeans.modules.autoupdate.updateprovider.AutoupdateCatalogParser.getUpdateItems(AutoupdateCatalogParser.java:148)
at org.netbeans.modules.autoupdate.updateprovider.AutoupdateCatalogProvider.getUpdateItems(AutoupdateCatalogProvider.java:110)
at org.netbeans.modules.autoupdate.services.UpdateUnitFactory.appendUpdateItems(UpdateUnitFactory.java:170)
at org.netbeans.modules.autoupdate.services.UpdateUnitFactory.getUpdateUnits(UpdateUnitFactory.java:140)
at org.netbeans.modules.autoupdate.services.UpdateManagerImpl$Cache.(UpdateManagerImpl.java:222)
at org.netbeans.modules.autoupdate.services.UpdateManagerImpl.getCache(UpdateManagerImpl.java:196)
at org.netbeans.modules.autoupdate.services.UpdateManagerImpl.getUpdateUnits(UpdateManagerImpl.java:93)
at org.netbeans.api.autoupdate.UpdateManager.getUpdateUnits(UpdateManager.java:100)
at org.netbeans.modules.autoupdate.ui.PluginManagerUI.refreshUnits(PluginManagerUI.java:537)
at org.netbeans.modules.autoupdate.ui.PluginManagerUI.updateUnitsChanged(PluginManagerUI.java:585)
at org.netbeans.modules.autoupdate.ui.UnitTab$3.updateUnitsChanged(UnitTab.java:187)
at org.netbeans.modules.autoupdate.ui.UnitCategoryTableModel.fireUpdataUnitChange(UnitCategoryTableModel.java:275)
at org.netbeans.modules.autoupdate.ui.UnitTab.fireUpdataUnitChange(UnitTab.java:552)
at org.netbeans.modules.autoupdate.ui.UnitTab$11$1.run(UnitTab.java:683)
at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:597)
at org.netbeans.core.TimableEventQueue.dispatchEvent(TimableEventQueue.java:104)
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)

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