Hi katit,
In this case you might want to try access it within the method itself:
[AllowRpc]
public static void PushToDevices(IPrincipal principal, EntityManager entityManager, params object[] args) {
var pushNotificator = IdeaBlade.Core.Composition.CompositionHost.Instance.GetExportedInstance<IPushNotificator>(false);
}
The cause of the issue might be that because ServerMethods is never instantiated, there isn't an instance of it to be referenced by the static method.
Regards,
Silvio.