building skill can't stop loading.....please help
The server at alexa.mitappinventor.mit.edu apparently is down , Perhaps that might be the problem.
You may want to try asking here> MIT App Inventor Alexa - MIT App Inventor Community
Otherwise the following might be appropriate.
Are you using this tutorial New conversational AI tutorial is out: Alexa Messenger ?
How did you try loading?
Did you ever get an Alexa skill to work or are you a first time user?
What this community knows about using Alexa. may be useful.