[solved]steamvr update 1.2.0 has 2 compiler error

Does anyone have the same problem after update steamver to 1.2.0?
These are two compiler errors I met
"Assets/SteamVR/Scripts/SteamVR_Status.cs(31,31):error CS0117: 'SteamVR_Utils' does not contain a definition for 'Event'
"Assets/SteamVR/Scripts/SteamVR_Status.cs(36,31):error CS0117: 'SteamVR_Utils' does not contain a definition for 'Event'