Hello everybody!
After years building native apps for Meta Quest 2 in Unity, Iām approaching this amazing tool Needle!
But I had a bad start 
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: āBuildPostProcessorā does not implement interface member āIBuildPostprocessor.PrepareForBuild(BuildPlayerOptions)ā
Iām using **Unity 2021.3.28f1 **and the latest version of the Needle Engine Unity Package.
Iām 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 " āBuildPostProcessorā 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: āCollaborativeSandbox.unityā is not valid: Incorrect extension. Required extension is: ā.scenetemplateā.
strange.
by user 1081852298373906473
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 ā.unityā extension), and then, it throws this error.
(I admit, I never used scene templates, so maybe Iām doing something wrong, but itās a strange error; itās like itās asking me to save a file as ā.scenetemplateā myself.)
by user 1081852298373906473
Yeah it doesnāt make sense that Unity complains about that. Does the .unity scene get saved or not at all? (Since itās just a warning)
Iāve googled a lot, but nothing that can clarify this behaviorā¦
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 
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 itās broken on all latest Unity Engine releases - as far as I know itās fixed internally and will be backported
Thanks for the investigation! Very very appreciated!
by user 1081852298373906473
