org.geowebcache.GeoWebCacheException: Problem communicating with GeoServer

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    org.geowebcache.GeoWebCacheException: Problem communicating with GeoServer

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    Root Cause Analysis

    1. java.lang.IllegalStateException

      Expected: RenderedImageMap, got null

      at org.geoserver.gwc.layer.GeoServerTileLayer.dispatchGetMap()
    2. org.geoserver.gwc
      GeoServerTileLayer.seedTile
      1. org.geoserver.gwc.layer.GeoServerTileLayer.dispatchGetMap(GeoServerTileLayer.java:628)
      2. org.geoserver.gwc.layer.GeoServerTileLayer.getMetatilingReponse(GeoServerTileLayer.java:569)
      3. org.geoserver.gwc.layer.GeoServerTileLayer.seedTile(GeoServerTileLayer.java:764)
      3 frames
    3. org.geowebcache.seed
      MTSeeder.call
      1. org.geowebcache.seed.SeedTask.doActionInternal(SeedTask.java:136)
      2. org.geowebcache.seed.GWCTask.doAction(GWCTask.java:76)
      3. org.geowebcache.seed.MTSeeder.call(MTSeeder.java:36)
      4. org.geowebcache.seed.MTSeeder.call(MTSeeder.java:25)
      4 frames
    4. Java RT
      Thread.run
      1. java.util.concurrent.FutureTask.run(FutureTask.java:262)
      2. java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
      3. java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
      4. java.lang.Thread.run(Thread.java:745)
      4 frames