Compile error in Unreal

Cesium for Unreal
1

I’m trying to follow the flight path tutorial Build a Flight Tracker with Cesium for Unreal – Cesium

I’m up to editing the build.cs file.

But when I compile I get the error:

Expecting to find a type to be declared in a target rules named ‘MapsEditorTarget’. This type must derive from the ‘TargetRules’ type defined by Unreal Build Tool.
Setting up bundled DotNet SDK
/Volumes/My Passport/Epic Games/UE_5.3/Engine/Build/BatchFiles/Mac/…/…/…/Binaries/ThirdParty/DotNet/6.0.302/mac-arm64
Running dotnet Engine/Binaries/DotNET/UnrealBuildTool/UnrealBuildTool.dll -ModuleWithSuffix=Maps,0442 MapsEditor Mac Development -Project=/Volumes/My Passport/Maps/Maps/Maps.uproject /Volumes/My Passport/Maps/Maps/Maps.uproject -architecture=arm64 -IgnoreJunk
Log file: /Users/username/Library/Application Support/Epic/UnrealBuildTool/Log.txt
Invalidating makefile for MapsEditor (Maps.Build.cs modified)
Errors generated while parsing ‘/Volumes/My Passport/Maps/Maps/Source/Maps/._Maps.Build.cs’
/Volumes/My Passport/Maps/Maps/Source/Maps/._Maps.Build.cs(1,1): error CS1056: Unexpected character '/Volumes/My Passport/Maps/Maps/Source/Maps/._Maps.Build.cs(1,47): error CS1056: Unexpected character 'Total execution time: 1.16 seconds

Additional information, I’m on a Mac. I tried installing visual studio, but there’s no option for C++
What do we do if we’re on Mac? Is that an issue? I have XCode installed.

2

It sounds like the Unreal Build Tool doesn’t like the contents of your _Maps.Build.cs file. It’s hard to say why without seeing it. That’s also kind of a strange filename, so I’m not sure what to make of it.

Unfortunately I don’t have a Mac and don’t have any first-hand experience trying to set up a new Unreal C++ project on one. I suspect you can find plenty of tutorials on the subject online, though.

3

Maps.build.cs looks like this:

// Fill out your copyright notice in the Description page of Project Settings.
using UnrealBuildTool;
public class Maps : ModuleRules
{
	public Maps(ReadOnlyTargetRules Target) : base(Target)
	{
		PCHUsage = PCHUsageMode.UseExplicitOrSharedPCHs;
	
		PublicDependencyModuleNames.AddRange(new string[] { "Core", "CoreUObject", "Engine", "InputCore" });

		PrivateDependencyModuleNames.AddRange(new string[] {  });

		// Uncomment if you are using Slate UI
		// PrivateDependencyModuleNames.AddRange(new string[] { "Slate", "SlateCore" });
		
		// Uncomment if you are using online features
		// PrivateDependencyModuleNames.Add("OnlineSubsystem");

		// To include OnlineSubsystemSteam, add it to the plugins section in your uproject file with the Enabled attribute set to true

		// Add Cesium for Unreal plugin dependency path
		PrivateDependencyModuleNames.AddRange(new string[] { "CesiumRuntime" });
		// Tell Unreal Engine to use C++17
		CppStandard = CppStandardVersion.Cpp17;
	}
}

Screen Shot 2023-10-23 at 7.40.23 pm
Screen Shot 2023-10-23 at 7.40.23 pm1430×800 86.3 KB

File structure looks like this

The C++ should compile fine through XCode

4

Nothing jumps out at me in your Build.cs file. The error seems to indicate that there’s an Unexpected character ' at line 1, column 1 in that file, but I don’t see it. I tried Googling it, and this looks relevant (especially the last posts at the bottom, which you may have to expand):
https://www.reddit.com/r/unrealengine/comments/123ghga/problem_with_compiling_c_on_mac_xcode_142/

Thanks a lot for the answer. Luckily I had already solved it by moving the project to the Mac SSD, so it no longer gave me any problems. Thanks a lot all the same

5

Thanks Kevin,

I was able to sort the compile error, but now the spline doesn’t show nor does the animation work despite everything else seeming correct. Screenshots here: Flight Tracker Tutorial - Spline not showing