The reported message is issued as a heuristic attempt to identify specific cases but, unfortunately, sometimes it is wrong.
In the latest versions of the client library we have fixed some spurious occurrences of the message; which SDK version are you using?

Other causes may prevent the correct loading of the Engine, as, for instance, a wrong url prefix supplied to "createEngine" (see this thread).
The problem happens before any attempt to connect to the Server, which is then not related with the issue.