"Missing Assembly Reference" Exception is thrown when creating a build with Light Weight Preview Template.

Prerequisites: Test with Unity Editor version 2018.1.0b5

Steps to Reproduce:
1. Create a new Project using Light Weight Preview Template.
2. Click on File Menu > Build Settings > Build
3. Observe the Exception on Console Window.

Expected Result:
The standalone build should be made.

Stack Trace:
For Windows
C:/ProgramData/Unity/cache/packages/staging-packages.unity.com/com.unity.render-pipelines.lightweight@0.1.21/Data/LightweightPipelineAsset.cs(2,19): error CS0234: The type or namespace name `ProjectWindowCallback' does not exist in the namespace `UnityEditor'. Are you missing an assembly reference?

For Mac:
/Users/macmini2a/Library/Unity/cache/packages/packages.unity.com/com.unity.render-pipelines.lightweight@0.1.21/Data/LightweightPipelineAsset.cs(2,19): error CS0234: The type or namespace name `ProjectWindowCallback' does not exist in the namespace `UnityEditor'. Are you missing an assembly reference?

Occurs on both Windows & Mac.

Note:
The exception is thrown when trying to build for Android and iOS Platforms.