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org.geowebcache.GeoWebCacheException: Problem communicating with GeoServer at org.geoserver.gwc.layer.GeoServerTileLayer.getMetatilingReponse( at org.geoserver.gwc.layer.GeoServerTileLayer.seedTile( at org.geowebcache.seed.SeedTask.doActionInternal( at org.geowebcache.seed.GWCTask.doAction( at at at at java.util.concurrent.ThreadPoolExecutor.runWorker( at java.util.concurrent.ThreadPoolExecutor$ at by: java.lang.IllegalStateException: Expected: RenderedImageMap, got null at org.geoserver.gwc.layer.GeoServerTileLayer.dispatchGetMap( at org.geoserver.gwc.layer.GeoServerTileLayer.getMetatilingReponse( ... 9 more