I found a log.
LogOutputDevice: === Handled error: ===
Ensure condition failed: false [File:D:\BuildFarm\buildmachine_++depot+UE4-Releases+4.7\Engine\Source\Runtime\Engine\Private\SceneComponent.cpp] [Line: 914]
Template Mismatch during attachment. Attaching instanced component to template component. Parent ‘CameraBoom’ Self ‘SideViewCamera’