Failed to launch the project on unreal engine

[anonymous_user_9b325d021 (anonymous_user_9b325d02)]

ThankUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUU

yes, it worked finally but there is a little problem
whenever it launches my actor or the character with the gun falls down or it penetrates through the floor and continiously falls down