I receieved such kind of messages almost 50 times from the time I started with Biztalk. But each a different solution worked..
Here are the options:
1) In your send ports .. Under Filters try BTS.ReceivePortName = [YourReceivePortName]
2) Terminate all the running and suspended instances
3) Restart the host instance.
4) Check the Queue name.That helped me lot of times
5) Try to delete evreything and try redoing it.. may you are doing something wrong if you are a beginner.. That helped me as I am a beginner myself.