Can not add jvm options to host/domain config

        <server name="server-one" group="main-server-group">
            <!-- server-one inherits the default socket-group declared in the server-group -->
            <jvm name="default">
                <jvm-options>
                   <option value="-Xrunjdwp:transport=dt_socket,address=8787,server=y,suspend=n"/>
                </jvm-options>
            </jvm>
        </server>

[Host Controller] 05:06:27,402 ERROR [org.jboss.as.controller] (Controller Boot Thread) Operation ("add-jvm-option") failed - address: ([
[Host Controller]     ("host" => "master"),
[Host Controller]     ("server-config" => "server-one"),
[Host Controller]     ("jvm" => "default")
[Host Controller] ]): java.lang.IllegalStateException: Duplicate resource [
[Host Controller]     ("host" => "master"),
[Host Controller]     ("server-config" => "server-one"),
[Host Controller]     ("jvm" => "default")
[Host Controller] ]
[Host Controller] 	at org.jboss.as.controller.OperationContextImpl.addResource(OperationContextImpl.java:830) [jboss-as-controller-7.1.0.Alpha2-SNAPSHOT.jar:7.1.0.Alpha2-SNAPSHOT]
...