Hi Brittaney,
If you haven't done so already try setting these values in the application.json:
{
appid: <insert app id here>, // This can be an empty string if there is no app id i.e. ""
portalUrl: <insert portal url where your content is hosted>,
oauthappid: ""
}
Then, in the applicationBase.json, try setting isEsri to false.
This should get rid of the error in the console and load the app. Please let use know if you run into any more issues.
Thanks,
Ryan