"Mapping new ns" Errors seem to be causing a Gradle build failed

[Scrappbot]

Mapping new ns http://schemas.android.com/sdk/android/repo/repository2/02 to old ns http://schemas.android.com/sdk/android/repo/repository2/01
0x00007ff682fa368d (Unity) StackWalker::GetCurrentCallstack
0x00007ff682faa369 (Unity) StackWalker::ShowCallstack
0x00007ff683f1b683 (Unity) GetStacktrace
0x00007ff6845b947d (Unity) DebugStringToFile
0x00007ff68218abd2 (Unity) DebugLogHandler_CUSTOM_Internal_Log
0x0000020baf6f05fa (Mono JIT Code) (wrapper managed-to-native) UnityEngine.DebugLogHandler:Internal_Log (UnityEngine.LogType,UnityEngine.LogOption,string,UnityEngine.Object)
0x0000020baf6f046b (Mono JIT Code) UnityEngine.DebugLogHandler:LogFormat (UnityEngine.LogType,UnityEngine.Object,string,object[ ])
0x0000020baf6df56e (Mono JIT Code) UnityEngine.Logger:Log (UnityEngine.LogType,object)
0x0000020baf6eff3d (Mono JIT Code) UnityEngine.Debug:LogWarning (object)
0x0000020baf6ee73b (Mono JIT Code) UnityEditor.Android.AndroidSDKTools:smile:etectErrorsAndWarnings (string,string,string[ ])
0x0000020baf6b74cb (Mono JIT Code) UnityEditor.Android.AndroidSDKTools:RunAndroidSdkTool (string,string,bool,string,string,string[ ])
0x0000020baf6b69c3 (Mono JIT Code) UnityEditor.Android.AndroidSDKTools:ListComponentsVersions ()
0x0000020baf6abde3 (Mono JIT Code) UnityEditor.Android.SDKManager:UpdatePackagesList ()
0x0000020baf6ab0db (Mono JIT Code) UnityEditor.Android.SDKManager:ListAvailable (UnityEditor.Android.SDKManager/Component)
0x0000020baf6aa2db (Mono JIT Code) UnityEditor.Android.PlayerSettingsEditorExtension/<>c__DisplayClass127_0:<StartGettingReleasedAPILevels>b__0 ()
0x0000020bc0199ca2 (Mono JIT Code) System.Threading.ThreadHelper:ThreadStart_Context (object)
0x0000020b8797668e (Mono JIT Code) System.Threading.ExecutionContext:RunInternal (System.Threading.ExecutionContext,System.Threading.ContextCallback,object,bool)
0x0000020b8797497b (Mono JIT Code) System.Threading.ExecutionContext:Run (System.Threading.ExecutionContext,System.Threading.ContextCallback,object,bool)
0x0000020bc01998b3 (Mono JIT Code) System.Threading.ExecutionContext:Run (System.Threading.ExecutionContext,System.Threading.ContextCallback,object)
0x0000020bc019917b (Mono JIT Code) System.Threading.ThreadHelper:ThreadStart ()
0x0000020bc0199038 (Mono JIT Code) (wrapper runtime-invoke) object:runtime_invoke_void__this__ (object,intptr,intptr,intptr)
0x00007ff8efe7fe24 (mono-2.0-bdwgc) [mini-runtime.c:3445] mono_jit_runtime_invoke 
0x00007ff8efdbe764 (mono-2.0-bdwgc) [object.c:3066] do_runtime_invoke 
0x00007ff8efdc219c (mono-2.0-bdwgc) [object.c:4458] mono_runtime_delegate_try_invoke 
0x00007ff8efded311 (mono-2.0-bdwgc) [threads.c:1292] start_wrapper_internal 
0x00007ff8efded4b6 (mono-2.0-bdwgc) [threads.c:1344] start_wrapper 
0x00007ff9850f7614 (KERNEL32) BaseThreadInitThunk
0x00007ff9866226b1 (ntdll) RtlUserThreadStart

This error, and 300 very similar ones, pop up when sometimes looking at Android player settings. Seems to pop up more consistently just after switching platforms to Android. The reason it’s a problem is because I believe the error is eventually leading to a timeout on a lock file for Gradle when I’m trying to build. 2 days before this error, I temporarily solved a similar occurring error with a missing Android config file. Popped up in the same place, and it was the cause of the build failing, so I believe these errors are preventing the build like the one before. I haven’t been able to find a solution. If anyone can help it would be appreciated.

[Kurt-Dekker]

Here’s a few more things to try:

How to troubleshoot build failures:

First, make a blank project with a single blank scene and prove that it builds successfully.

If the blank project does NOT build, go fix your Unity installation or your other tools, such as Android SDK, NDK, JDK, etc. It may even be necessary to change to a different version of Unity3D. It is generally best to stay with LTS versions of Unity3D.

Until you can build a blank project to the target platform, don’t fiddle with anything else.

Once you can build a blank project, now bisect the problem by bringing over parts of your current project and building it one subsystem at a time, perhaps stubbing things out that might trigger compiler errors.

Most often things that prevent building are third-party libraries such as Firebase.

Once you identify the subsystem, go to the documentation for it and make sure you are doing it correctly.

It may also be helpful to work through a tutorial or two for whatever subsystem is making the build fail.

Android build not building:

Recently (circa July 2022) there have been reports of Unity’s installer failing to install the Android Tools.

Can't build for Android

Latest Hub 3.2.0 in combination with Unity 2021.3.6 can't build for Android because there is a missing Tools folder inside *Editor\Data\PlaybackEngines\AndroidPlayer* so Unity can't find gradle. That folder is simply not created during the installation. The workaround is to copy the whole Tools folder from the previous Unity version or if you don't have the previous version then do what [mention|1j+oWeNEPCI6ejbN15sncw==] says in the post below .

Here was how I brought up Unity2020.3.41 and the Android SDK 31 on October 30, 2022:

.AAB Build Targeting API Level 33 on Unity 2021.3.8 with JDK 1.8.

Hey, coincidentally I just upgraded to Android SDK31 today… why not wait until nearly the last minute? It was a wild ride, took most of the day. Let me tell you what I did, what I found. First of all, I’m using Unity2020.3.41 (hereinafter referred to Unity*) because that’s all the further I need to go forward right now. I found that Unity* only accepts up to SDK30.0.3 tools, but will build using those tools and SDK31. Next I found that Android Studio will not install anything except Android …

Android Gradle errors and other related stuff:

Unity Gradle bug... please help

Fix: