ARFoundation black screen [iOS/iPAD]

Some tech info first:
Unity Version: 2018.3.5f1
ARFoundation Version: 1.5.0-preview 6
ARKit XR Plugin: 2.1.1
XCode version: 10.2.1 (10E1001)
iPAD Version: 12.3.1 (16F203)

[x] Yes, I added the Camera Usage description
[x] Yes, I authorized the use of the camera by the app when lauching

I followed this tutorial [

]

Here is the log when I build and open the app:

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2019-08-01 17:49:43.267700-0300 cidadeAR[2117:638912] [DYMTLInitPlatform] platform initialization successful

2019-08-01 17:49:43.291099-0300 cidadeAR[2117:638868] [MC] System group container for systemgroup.com.apple.configurationprofiles path is /private/var/containers/Shared/SystemGroup/systemgroup.com.apple.configurationprofiles

2019-08-01 17:49:43.291601-0300 cidadeAR[2117:638868] [MC] Reading from public effective user settings.

2019-08-01 17:49:43.301821-0300 cidadeAR[2117:638868] Built from '2018.3/release' branch, Version '2018.3.5f1 (76b3e37670a4)', Build type 'Release', Scripting Backend 'il2cpp'

2019-08-01 17:49:43.303247-0300 cidadeAR[2117:638868] -> registered mono modules 0x105f82a40

-> applicationDidFinishLaunching()

2019-08-01 17:49:43.378728-0300 cidadeAR[2117:638868] Metal GPU Frame Capture Enabled

2019-08-01 17:49:43.379691-0300 cidadeAR[2117:638868] Metal API Validation Disabled

2019-08-01 17:49:43.459420-0300 cidadeAR[2117:638868] [Warning] Trying to set delaysTouchesBegan to NO on a system gate gesture recognizer - this is unsupported and will have undesired side effects

-> applicationDidBecomeActive()

Initializing Metal device caps: Apple A10 GPU

Initialize engine version: 2018.3.5f1 (76b3e37670a4)

WARNING: Shader Unsupported: 'Standard' - Pass 'META' has no vertex shader

WARNING: Shader Unsupported: 'Standard' - Pass 'META' has no vertex shader

WARNING: Shader Unsupported: 'Legacy Shaders/Diffuse' - Pass 'DEFERRED' has no vertex shader

WARNING: Shader Unsupported: 'Legacy Shaders/Diffuse' - Pass 'Meta' has no vertex shader

WARNING: Shader Unsupported: 'MASK/MainShader' - Pass 'Meta' has no vertex shader

UnloadTime: 0.346000 ms

NullReferenceException: Object reference not set to an instance of an object.

at UnityEngine.XR.ARFoundation.ARCameraBackground.CreateMaterialFromSubsystemShader () [0x00000] in <00000000000000000000000000000000>:0

at UnityEngine.XR.ARFoundation.ARCameraBackground.get_subsystemMaterial () [0x00000] in <00000000000000000000000000000000>:0

at UnityEngine.XR.ARFoundation.ARCameraBackground.UpdateMaterial () [0x00000] in <00000000000000000000000000000000>:0

at UnityEngine.XR.ARFoundation.ARCameraBackground.OnEnable () [0x00000] in <00000000000000000000000000000000>:0


(Filename: currently not available on il2cpp Line: -1)


NullReferenceException: Object reference not set to an instance of an object.

at TapToPlace.UpdatePlacementePose () [0x00000] in <00000000000000000000000000000000>:0

at TapToPlace.Update () [0x00000] in <00000000000000000000000000000000>:0


(Filename: currently not available on il2cpp Line: -1)


2019-08-01 17:52:12.604877-0300 cidadeAR[2117:639026] [Technique] World tracking performance is being affected by resource constraints [1]

-> applicationWillResignActive()

-> applicationDidEnterBackground()

-> applicationWillTerminate()

Setting up 1 worker threads for Enlighten.

Thread -> id: 16c60b000 -> priority: 1

NullReferenceException: Object reference not set to an instance of an object.

at UnityEngine.XR.ARFoundation.ARCameraBackground.OnDisable () [0x00000] in <00000000000000000000000000000000>:0


(Filename: currently not available on il2cpp Line: -1)
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