Reproduction Steps:
1. Create new project
2. Import "Easy Save - The Complete Save & Load Asset for Unity" package from AssetStore
https://www.assetstore.unity3d.com/en/#!/content/768
3. Switch to iOS or Android platform
4. Select IL2CPP backend in PlayerSettings
5. Build
6. Notice that build is incomplete, stopped and errors are thrown.

Expected behaviour: Building should complete.
Actual result: Builds do not complete with EasySave2 package.

Bug reproduced on Android and iOS platforms.

Reproduced on versions: Unity 5.6.0a6, 5.6.0b1, 5.6.0b3
Did not reproduce: Unity 5.4.4f1, 5.5.0p3
Regression introduced in Unity 5.6