Second UE4 install conflicting with building the engine

Hey Guys.

I am trying to build a HelloWorld class to learn how to build the engine properly. The issue seems that there is a conflicting install of the engine that is “confusing” my build. I have pasted the error below.

The build I want to use is at:
U:\Branches\Engine
U:\Branches\UE4.sln

My project is at:
U:\Branches\MyProject

The old installation is at:
D:\Programs\UnrealEngine\4.0…

The error below comes up when I rename the old installation to something that the build wont recognize. If I leave it alone it actually succeeds however the classes don’t actually show up.

---- Build started: Project: MyProject, Configuration: Development_RocketGame x64 ------
1>EXEC : error : Couldn't find target rules file for target 'MyProject' in rules assembly 'MyProjectModuleRules, Version=0.0.0.0, Culture=neutral, PublicKeyToken=null'.
1>  Location: U:\Branches\Intermediate\Build\BuildRules\MyProjectModuleRules.dll
1>  Target rules found:
1>  	UE4Game - D:\Programs\UnrealEngine\4.0\Engine\Source\UE4Game.Target.cs
1>  
1>C:\Program Files (x86)\MSBuild\Microsoft.Cpp\v4.0\V120\Microsoft.MakeFile.Targets(38,5): error MSB3073: The command "D:\Programs\UnrealEngine\4.0\Engine\Build\BatchFiles\Build.bat MyProject Win64 Development "U:\Branches\UE4.uproject" -rocket" exited with code -1.
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========

I apologize if this is vague, I am just going off what I can see at the moment.