Targets with a unique build environment cannot be built with an installed engine.

[Truksama]

Hi, I followed the thread linked below when encountering the same issue, and it helped me resolve the issue.

Generate Project files fails on Installed / Binary Build

In case someone else needs help resolving this: try commenting out “BuildEnvironment = TargetBuildEnvironment.Unique;” in the Target.cs file(s) of your project