"GetStateVariable" is a deprecated UPnP method and newer routers do not support it anymore. If those were the only messages you got, then it is probably nothing to worry about. The aMule implementation of UPnP does not depend upon the results of these calls, they are only informative, so, UPnP should be working fine.
To be sure, you should enable UPnP debug logging in the preferences and post the longer log produced, which should be much more informative.