Getting Class X Not Found - OtherCompilationError 5

Hello,

We’re trying to update our game to UE 4.13, and with the default clean engine download (we’re importing our game-related fixes after).

We’re getting this error upon compiling our game with the new engine:

29>------ Build started: Project: , Configuration: Development_Editor x64 ------
29> /UnrealEngine/Engine/Source/Editor/Sequencer/Public/ISequencer.h(95) : Class 'IMovieScenePlayer' not found.
29>Error : Failed to generate code for - error code: OtherCompilationError (5)

In our project.Build.cs, I tried adding "MovieScene" to PublicDependencyModuleNames.AddRange(new string[] { ... }); but this did not help.

I’m going to keep trying to find a solution, but if anyone can help identify what we’re missing it’d be appreciated.

Thanks!