Unable to build project on Mac

I’m trying to build a project using Xcode (10.3) on my Mac to help a team with audio work. I’m able to “generate Xcode project” by right-clicking the .uproject file, and can open the Xcode project. When attempting to build from Xcode however, I’m getting an error that says “No viable conversion from ‘bool’ to ‘TSubclassOf’”, which is a part of a basic movement script in the game. Their programmer has verified that there should’t be an issue with the code. From my very limited understanding, it seems that there is a problem with Xcode not being configured correctly/missing some SDKs?

FWIW I tried to create a new Unreal project using a C++ template, then replicating the exact same process as above, and that worked fine.