java.lang.ClassCastException: water.fvec.Frame cannot be cast to water.ValueArray

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java.lang.ClassCastException: water.fvec.Frame cannot be cast to water.ValueArray
at water.ValueArray.frameAsVA(ValueArray.java:660)
at water.api.RequestArguments$H2OHexKey.parse(RequestArguments.java:1669)
at water.api.RequestArguments$H2OHexKey.parse(RequestArguments.java:1653)
at water.api.RequestArguments$Argument.check(RequestArguments.java:546)
at water.api.RequestQueries.checkArguments(RequestQueries.java:69)
at water.api.Request.serveGrid(Request.java:125)
at water.api.Request.serve(Request.java:108)
at water.api.RequestServer.serve(RequestServer.java:286)
at water.NanoHTTPD$HTTPSession.run(NanoHTTPD.java:421)
at java.lang.Thread.run(Thread.java:724)

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