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It's a  security thing for android 17 for  unverified Developers apks that means I have to pay 25$ to get a verified certification and put it my apk somebs  but u can install it anyways if u do this   

Enable Developer options by tapping Build number seven times.

Go to Settings → System → Developer options.

Turn on Allow Unverified Packages.

Complete the anti-scam warnings and enter your PIN.

Restart the phone. 

Confirm again, then allow unverified packages for 7 days or indefinitely. 

Note there is a Wait the mandatory 24-hour cooling-off period. To do it again  and u can look up all of this if u want