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Problem communicating with GeoServer
org.geowebcache.GeoWebCacheException: Problem communicating with GeoServer at org.geoserver.gwc.layer.GeoServerTileLayer.getMetatilingReponse(GeoServerTileLayer.java:575) at org.geoserver.gwc.layer.GeoServerTileLayer.seedTile(GeoServerTileLayer.java:764) at org.geowebcache.seed.SeedTask.doActionInternal(SeedTask.java:136) at org.geowebcache.seed.GWCTask.doAction(GWCTask.java:76) at org.geowebcache.seed.MTSeeder.call(MTSeeder.java:36) at org.geowebcache.seed.MTSeeder.call(MTSeeder.java:25) at java.util.concurrent.FutureTask.run(FutureTask.java:262) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) at java.lang.Thread.run(Thread.java:745)Caused by: java.lang.IllegalStateException: Expected: RenderedImageMap, got null at org.geoserver.gwc.layer.GeoServerTileLayer.dispatchGetMap(GeoServerTileLayer.java:628) at org.geoserver.gwc.layer.GeoServerTileLayer.getMetatilingReponse(GeoServerTileLayer.java:569) ... 9 more