Unity 2021 Error " 'BuildPostProcessor' does not implement interface member"

Hello everybody!
After years building native apps for Meta Quest 2 in Unity, I’m approaching this amazing tool Needle!

But I had a bad start :confused:
Following the step by step guide, after refreshing the assets, I received this error:
Library\PackageCache\com.needle.engine-exporter@3.7.5-pre.2\Core\Editor\Internals\BuildTarget\NeedleEngineBuildTarget.cs(17,38): error CS0535: ‘BuildPostProcessor’ does not implement interface member ‘IBuildPostprocessor.PrepareForBuild(BuildPlayerOptions)’

I’m using **Unity 2021.3.28f1 **and the latest version of the Needle Engine Unity Package.
I’m looking forward to creating amazing VR web applications with Needle!

Original Post on Discord

by user 1081852298373906473

Hi, will check that, I think they changed it internally in some minor version (I remember adding a fix for it for one Unity version)

Changed the channel name: Unity 2021 Error " ‘BuildPostProcessor’ does not implement interface member"

Can you try updating to 3.7.5-pre.3 ?

YAY it worked!

by user 1081852298373906473

Another problem:
Save SceneTemplate has failed. Asset path error: ‘CollaborativeSandbox.unity’ is not valid: Incorrect extension. Required extension is: ‘.scenetemplate’.

by user 1081852298373906473

When did this happen?

The moment I try to create a scene from the Needle Templates.
It asks a path and name for the new scene (it propose a file with the “.unity” extension), and then, it throws this error.
(I admit, I never used scene templates, so maybe I’m doing something wrong, but it’s a strange error; it’s like it’s asking me to save a file as “.scenetemplate” myself.)

by user 1081852298373906473

Yeah it doesn’t make sense that Unity complains about that. Does the .unity scene get saved or not at all? (Since it’s just a warning)

I’ve googled a lot, but nothing that can clarify this behavior…
Ok, I can start step-by-step by creating prefabs and connecting components from scratch, but a fully functional scene might be nice and easier to start with :slightly_smiling_face:

by user 1081852298373906473

You can use the menu item in needle engine for the basic setup but yes the template scenes should work (and did previously, its the first time i see this message)

Needle Engine/Setup Scene

Ok, thanks!

by user 1081852298373906473

Hi, it seems to be that scene templates are broken in Unity 2021.3.28 - creating a new scene from a template fails as soon as the scene contains any prefab.

^ Reported this to Unity as IN-47133

Seems like it’s broken on all latest Unity Engine releases - as far as I know it’s fixed internally and will be backported

Thanks for the investigation! Very very appreciated!

by user 1081852298373906473