Twilio Test Credentials

I'm trying to use my test credentials to make a call from my browser, and a js error is always raising before making any call:

 Object { message="No valid account",  code=31203}

I put my test credentials everywhere and I used my app_sid to generate a token using Twilio Capability like this: http://ift.tt/1Cp0N4e

I was able to use this app with production credentials, but not for test.

What is missing?

Thanks,