java.lang.ClassCastException: hex.GridSearch cannot be cast to hex.gbm.GBM$GBMModel

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java.lang.ClassCastException: hex.GridSearch cannot be cast to hex.gbm.GBM$GBMModel
at water.api.GBMModelView.serve(GBMModelView.java:31)
at water.api.Request.serveGrid(Request.java:129)
at water.Request2.superServeGrid(Request2.java:466)
at water.Request2.serveGrid(Request2.java:387)
at water.api.Request.serve(Request.java:108)
at water.api.RequestServer.serve(RequestServer.java:314)
at water.NanoHTTPD$HTTPSession.run(NanoHTTPD.java:421)
at java.lang.Thread.run(Thread.java:744)

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