Hello I'm new on Office 365/SharePoint 2013 Apps development, as first test project I have created an Outlook App (Mail app for Office), I didn't edit the simple code generated by NAPA, normally it will work, but when I deploy the app I get this error :

App Error Something went wrong and we couldn't start this app. Please try again later or contact your system administrator.

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After some debugging, via the F12 Tools, I find that the https://appsforoffice.microsoft.com/lib/1.0/hosted/office.js is not available! Is there a solution for this problem ?

EDIT : The site is available over http but not over https, then I tried to use it but it still not working:

The page at 'https://grindi-81a84eec62----.sharepoint.com/FirstMailApp/App/Home/Home.htm…#path=/mail' was loaded over HTTPS, but ran insecure content from 'http://appsforoffice.microsoft.com/lib/1.0/hosted/office.js': this content should also be loaded over HTTPS.

  • Hey I had the same issue with my computer. I wasted my time on it for many days but finally I got a solution from this link microsoftliveassist.com/…
    – user29735
    Jun 17, 2014 at 9:26

1 Answer 1


SOLVED : the issue is only happen when I debug my app in Napa, and at the same time I'm signed in to MSDN sites. If I logout from the MSDN, the issue is solved.

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