re-install unity but dll missing

When I re-install unity and import a project, I get a error shown as follows:

DllNotFoundException: LeapCSharp

Leap.LeapPINVOKE+SWIGExceptionHelper…cctor ()

Rethrow as TypeInitializationException: An exception was thrown by the type initializer for SWIGExceptionHelper

Leap.LeapPINVOKE…cctor ()

Rethrow as TypeInitializationException: An exception was thrown by the type initializer for Leap.LeapPINVOKE

Leap.Frame…ctor ()

LeapRecorder…ctor ()

HandController…ctor ()

The project can run correctly before I re-install unity client without error as shown.

With the error the project can be run, but the error information holds at the console.

Try and import this package: https://s3.amazonaws.com/lm-assets/unity-assets/vr/LeapMotionVRAssets.unitypackage
It should add all required missing files.

If this doesn’t work re-install the Leap Motion drivers: Ultraleap for Developers