com.google.gwt.user.client.rpc.SerializationException

Please help with error below.

Is this mean that the class com.voxbone.voxAPI.Country could not be
serialize or it is just simple
NoClassDefFoundError ?

Exception while dispatching incoming RPC call
com.google.gwt.user.client.rpc.SerializationException: Type
'org.dozer.MappingException' was not included in the set of types
which can be serialized by this SerializationPolicy or its Class
object could not be loaded. For security purposes, this type will not
be serialized.: instance = org.dozer.MappingException:
java.lang.NoClassDefFoundError: Could not initialize class
com.voxbone.voxAPI.Country
at
com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.serialize(ServerSerializationStreamWriter.java:
610)
at
com.google.gwt.user.client.rpc.impl.AbstractSerializationStreamWriter.writeObject(AbstractSerializationStreamWriter.java:
129)
at
com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter
$ValueWriter$8.write(ServerSerializationStreamWriter.java:152)
at
com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.serializeValue(ServerSerializationStreamWriter.java:
534)
at com.google.gwt.user.server.rpc.RPC.encodeResponse(RPC.java:
609)
at
com.google.gwt.user.server.rpc.RPC.encodeResponseForFailure(RPC.java:
383)
at
com.google.gwt.user.server.rpc.RPC.invokeAndEncodeResponse(RPC.java:
581)
at
com.google.gwt.user.server.rpc.RemoteServiceServlet.processCall(RemoteServiceServlet.java:
188)
at
com.google.gwt.user.server.rpc.RemoteServiceServlet.processPost(RemoteServiceServlet.java:
224)
at
com.google.gwt.user.server.rpc.AbstractRemoteServiceServlet.doPost(AbstractRemoteServiceServlet.java:
62)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:
710)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)

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