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java.lang.UnsupportedOperationException: JsonNull at com.google.gson.JsonElement.getAsString(JsonElement.java:191) at net.servicestack.client.Utils.createResponseStatus(Utils.java:555) at net.servicestack.client.Utils.createResponseStatus(Utils.java:537) at net.servicestack.client.JsonServiceClient.createException(JsonServiceClient.java:216) at net.servicestack.client.JsonServiceClient.send(JsonServiceClient.java:339)