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Project can play in Unity Editor Mode but is unable to build for HoloLens
Hello,
I'm currently writting a HoloLens app in Unity. For this, I'm using the latest Unity3D (5.5.0f3) and HoloToolkit (1.5.5.0) versions as of now. I've applied the project settings located in the menu "HoloToolkit>Configure>Apply HoloLens Project Settings" .
On top of that, I am using several external DLLs, among which RestSharp and Manatee.Json. I've put those DLLs in my "Assets/Scripts/_External" folder, using their net35 version each time.
As I've said in the question title, the project runs perfectly during play mode, with 0 warnings. However, when I try to buildthe project, I get several errors :
When building with HoloToolkit default settings : "Compilation Overrides>Use Net Core" is enabled
- The build process fails at the last step. I get 2 large errors mentioning issues like
Error: method 'System.Boolean System.Type::get_IsAbstract()' doesn't exist in target framework. It is referenced from Manatee.Json.dll at T. Every time there is an error, the issue seems related to this DLL. - I've tried removing every refference to "Manatee.Json.dll". In this case, the build completes, but I then have 380 errors like the following :
Error: type 'System.ComponentModel.DescriptionAttribute' doesn't exist in target framework.
- The build process fails at the last step. I get 2 large errors mentioning issues like
When building with the "Compilation Overrides>None" setting :
- The build process does not start, and I have 4 errors mentioning issues like
Feature 'asynchronous functions' cannot be used because it is not part of the C# 4.0 language specification. The 2 classes involved are part of HoloToolkit, "MeshSaver.cs" and "GenericNetworkTransmitter.cs" .
- The build process does not start, and I have 4 errors mentioning issues like
I am a bit at loss right now, and can't figure a way to solve my issue.
Best Answer
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ASerre
✭
@gutia After struggling for a while, and trying every possible setting I could think of, I finally managed to get my project to build by keeping the default "Use Net Core" setting. In Unity, for every external DLL, I applied the following settings :
- "SDK>UWP"
- "ScriptingBackend>Dot Net"
- "Don't Process>Checked"
I'm not sure wether all of those options need to be enabled. I think the key to make it work is the "Don't Process" checkbox.
So, apparently, I've just lost 2 days of debbugging over a simple checkbox
This was my 1st time using external DLLs on Unity, so I don't know if this is a common occurence or not. Either way, I learnt it the hard way ...EDIT: The checkbox seems to be the way to go for RestSharp and Manatee.Json, and any other library not relying on MonoBehaviour. More details in the Unity documentation.
5
Answers
Got exactly same issue just now. Did you figure out a solution?
@gutia After struggling for a while, and trying every possible setting I could think of, I finally managed to get my project to build by keeping the default "Use Net Core" setting. In Unity, for every external DLL, I applied the following settings :
I'm not sure wether all of those options need to be enabled. I think the key to make it work is the "Don't Process" checkbox.
So, apparently, I've just lost 2 days of debbugging over a simple checkbox
This was my 1st time using external DLLs on Unity, so I don't know if this is a common occurence or not. Either way, I learnt it the hard way ...
EDIT: The checkbox seems to be the way to go for RestSharp and Manatee.Json, and any other library not relying on MonoBehaviour. More details in the Unity documentation.
Thank you @ASerre! I wasn't able to find this "Don't Process" checkbox in Unity personal edition. Also SDK > Universal 10 (no option for UWP). But setting "Build and Run On" Windows Phone resolved the issue (instead of local machine and windows phone). I assume I should have had this setting earlier, but I am new to Windows Apps...
@ASerre, I'm the creator of Manatee.Json. I'm curious how my library ended up being referenced in a HoloLens project.
Also, as of version 7.0, .netstandard 1.4+ is supported. You may be able to upgrade and eliminate that error.