Help App not installed Error

[Yuichan]

So, when I try to install an app now, I just get "App not installed".
Yes, I have unknown sources checked. Its also happening with xPosed fw as well. Tried googling it but my problem is that it DOESN'T lie within the Google Play store.
Please Help.

 

[Yuichan]

K. So. Heads up. Don't install x installer. It breaks the installation process
Can I get this closed