Have you ever found error “this app is a device administrator and must be deactivated before uninstalling” on your android phone
You can uninstall the apps by performing below steps
1. Go to SETTINGS
2. Go to Location and Security
3. Go to Device Administrator
4. deselect the application that you want to uninstall.
5. Click deactivate
And then you can uninstall the apps
I found this issue with one of my application, exMail
Hope this article is useful for you