Alexa project problem

building skill can't stop loading.....please help

The server at 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.