Huawei Mate 10 Lite turns off when I put the back cover on

I opened the case of the phone for screen replacement, did the screen replacement, everything works smoothly when I run it without the back cover, but when I put the back cover on the phone, the phone turns off and the red notification light flashes.

When I remove the cover and press the power button, the phone turns on without any problem. What is the problem, can you help?