Dear customer,
log in please your user account and open Support page.
Below this forum you can find our contact form. Use it to report the problem. Explain please more detailed, when appears the error, what is on the screen, what type of phone do you have.
Kidlogger
All the ideas and discussions
Kidlogger PRO doesn't work on Android 6 Marshmallows systems. You can download but you can't install it.