Question Error Upgrading from AR-Foundation 2.2.0 - preview 3 to 4.1.7 - no suitable method found to override

Hello,

I needed to upgrade an iOS AR Projekt from Unity 2019.2.0f1 to Unity 2020.3.23f1.
AR-Foundation and AR-Kit was upgraded from 2.2.0 - preview 3 to 4.1.7.
But I get cannot run any scene because of this Error:

Library/PackageCache/com.unity.xr.arkit@4.1.7/Runtime/ARKitSessionSubsystem.cs(345,34): error CS0115: 'ARKitSessionSubsystem.ARKitProvider.Update(XRSessionUpdateParams, Configuration)': no suitable method found to override

I tried out different Package Versions, but no success. Is there anything I missed?

Here also my manifest.json if helpful:

{
"dependencies": {
"com.unity.2d.sprite": "1.0.0",
"com.unity.2d.tilemap": "1.0.0",
"com.unity.collab-proxy": "1.15.1",
"com.unity.ext.nunit": "1.0.6",
"com.unity.ide.rider": "2.0.7",
"com.unity.ide.visualstudio": "2.0.11",
"com.unity.ide.vscode": "1.2.4",
"com.unity.postprocessing": "2.3.0",
"com.unity.recorder": "2.5.7",
"com.unity.test-framework": "1.1.29",
"com.unity.textmeshpro": "3.0.6",
"com.unity.timeline": "1.4.8",
"com.unity.ugui": "1.0.0",
"com.unity.xr.arfoundation": "4.1.7",
"com.unity.xr.arkit": "4.1.7",
"com.unity.xr.management": "4.1.0",
"com.unity.modules.ai": "1.0.0",
"com.unity.modules.androidjni": "1.0.0",
"com.unity.modules.animation": "1.0.0",
"com.unity.modules.assetbundle": "1.0.0",
"com.unity.modules.audio": "1.0.0",
"com.unity.modules.cloth": "1.0.0",
"com.unity.modules.director": "1.0.0",
"com.unity.modules.imageconversion": "1.0.0",
"com.unity.modules.imgui": "1.0.0",
"com.unity.modules.jsonserialize": "1.0.0",
"com.unity.modules.particlesystem": "1.0.0",
"com.unity.modules.physics": "1.0.0",
"com.unity.modules.physics2d": "1.0.0",
"com.unity.modules.screencapture": "1.0.0",
"com.unity.modules.terrain": "1.0.0",
"com.unity.modules.terrainphysics": "1.0.0",
"com.unity.modules.tilemap": "1.0.0",
"com.unity.modules.ui": "1.0.0",
"com.unity.modules.uielements": "1.0.0",
"com.unity.modules.umbra": "1.0.0",
"com.unity.modules.unityanalytics": "1.0.0",
"com.unity.modules.unitywebrequest": "1.0.0",
"com.unity.modules.unitywebrequestassetbundle": "1.0.0",
"com.unity.modules.unitywebrequestaudio": "1.0.0",
"com.unity.modules.unitywebrequesttexture": "1.0.0",
"com.unity.modules.unitywebrequestwww": "1.0.0",
"com.unity.modules.vehicles": "1.0.0",
"com.unity.modules.video": "1.0.0",
"com.unity.modules.vr": "1.0.0",
"com.unity.modules.wind": "1.0.0",
"com.unity.modules.xr": "1.0.0"
}
}

 

Please try to install the AR Subsystems 4.1.7 package.

 

AR Subsystems 4.1.7 is already installed. I also tried already upgrading all to 4.2.1, but same error..

 

That error looks like a red herring. Is this the only error? There may be other errors that are preventing the this assembly from being recompiled. You can also try closing Unity and nuking your Library folder to force a full reimport (this can take some time depending on the size of your project, though).