Hello, I faced the same issue using SDK 1.8.0 - RM 3.21 and ctrlX WORKS 1.8.3. After getting this error I tried to install the snap on the same VM I used to build it. The installation was not succesfull and I got the same message in the terminal. Running jounralctl -u snapd I got container.go:177: in snap "hello-webserver": "." should be world-readable and executable, and isn't: drwxrwx---
container.go:201: in snap "hello-webserver": "meta/gui/icon.png" should be world-readable, and isn't: -rwxrwx--- After playing alittle bit with the permission, I think all you need to change is chmod 774 snap/icons/icon.png
chmod 775 www
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