I have just upgraded my botframework from 3.0 to 3.5. it made changes into packages.config file and web.config file. I build the visual studio solution and it's building. but when I start the bot emulator it and send a message Hi, it gives me a error " Response status code does not indicate success: 400" and emulator displayed this message "Exception: Object reference not set to an instance of an object. [File of type 'text/plain']" see below image.
My question is it require to upgrade the bot connector (at azure side) also after upgrading the bot framework.
I am not sure what is the problem here. please suggests