11-23-2018 07:34 AM
Thank you for having your interests to my app 🙂
Did you import msapp (change extension to .zip) file ?
This error may occur because msapp file is not package file.
In order to open msapp, please follow below steps:
1. Create some app from blank
2. Click [File] tab and select open from local file
* https://powerusers.microsoft.com/t5/General-Discussion/How-to-import-msapp-file/td-p/134261 this link may help you.
Please let me know if you have any