I am working on Bot framework technology, recently Microsoft announced the new version (V3) of bot. I was already developed bots using old version, now I am trying to upgrade m
They just released an updated version of the framework (3.0.1) that addressed a few issues introduced with 3.0.0. Try updating to 3.0.1 and see if that will solve your issue (it fixed mine). source
You may also need to follow this tutorial and use ngrok to allow you to access your published chatbot from the emulator. There is a screenshot in that tutorial that shows the BotId being used in the emulator, its not required so you can omit it.