I have just configured a Post-build action in Jenkins in order to upload the builds to AppCenter. After the new build is created successfully by gradle, the Upload to AppCenter task starts and returns the following exceptions, causing the build to fail:

 

Creating an upload resource.

io.jenkins.plugins.appcenter.AppCenterException: Create upload resource unsuccessful:

        at io.jenkins.plugins.appcenter.task.internal.CreateUploadResourceTask.lambda$execute$0(CreateUploadResourceTask.java:48)

        at java.util.concurrent.CompletableFuture.uniWhenComplete(CompletableFuture.java:760)

        at java.util.concurrent.CompletableFuture$UniWhenComplete.tryFire(CompletableFuture.java:736)

        at java.util.concurrent.CompletableFuture.postComplete(CompletableFuture.java:474)

        at java.util.concurrent.CompletableFuture.completeExceptionally(CompletableFuture.java:1977)

        at retrofit2.CompletableFutureCallAdapterFactory$BodyCallAdapter$2.onResponse(CompletableFutureCallAdapterFactory.java:81)

        at retrofit2.OkHttpCall$1.onResponse(OkHttpCall.java:129)

        at okhttp3.RealCall$AsyncCall.execute(RealCall.java:174)

        at okhttp3.internal.NamedRunnable.run(NamedRunnable.java:32)

        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)

        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)

        at java.lang.Thread.run(Thread.java:745)

Caused by: retrofit2.HttpException: HTTP 404 Not Found

        ... 7 more

io.jenkins.plugins.appcenter.AppCenterException: Upload to AppCenter failed.

        at io.jenkins.plugins.appcenter.task.UploadTask.call(UploadTask.java:56)

        at io.jenkins.plugins.appcenter.task.UploadTask.call(UploadTask.java:17)

        at hudson.remoting.UserRequest.perform(UserRequest.java:212)

        at hudson.remoting.UserRequest.perform(UserRequest.java:54)

        at hudson.remoting.Request$2.run(Request.java:369)

        at hudson.remoting.InterceptingExecutorService$1.call(InterceptingExecutorService.java:72)

        at java.util.concurrent.FutureTask.run(FutureTask.java:266)

        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)

        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)

        at java.lang.Thread.run(Thread.java:745)

        Suppressed: hudson.remoting.Channel$CallSiteStackTrace: Remote call to mobile-build-mac

               at hudson.remoting.Channel.attachCallSiteStackTrace(Channel.java:1743)

               at hudson.remoting.UserRequest$ExceptionResponse.retrieve(UserRequest.java:357)

               at hudson.remoting.Channel.call(Channel.java:957)

               at hudson.FilePath.act(FilePath.java:1160)

               at io.jenkins.plugins.appcenter.AppCenterRecorder.uploadToAppCenter(AppCenterRecorder.java:131)

               at io.jenkins.plugins.appcenter.AppCenterRecorder.perform(AppCenterRecorder.java:118)

               at hudson.tasks.BuildStepCompatibilityLayer.perform(BuildStepCompatibilityLayer.java:79)

               at hudson.tasks.BuildStepMonitor$1.perform(BuildStepMonitor.java:20)

               at hudson.model.AbstractBuild$AbstractBuildExecution.perform(AbstractBuild.java:741)

               at hudson.model.AbstractBuild$AbstractBuildExecution.performAllBuildSteps(AbstractBuild.java:690)

               at hudson.model.Build$BuildExecution.post2(Build.java:186)

               at hudson.model.AbstractBuild$AbstractBuildExecution.post(AbstractBuild.java:635)

               at hudson.model.Run.execute(Run.java:1843)

               at hudson.model.FreeStyleBuild.run(FreeStyleBuild.java:43)

               at hudson.model.ResourceController.execute(ResourceController.java:97)

               at hudson.model.Executor.run(Executor.java:429)

Caused by: java.util.concurrent.ExecutionException: io.jenkins.plugins.appcenter.AppCenterException: Create upload resource unsuccessful:

        at java.util.concurrent.CompletableFuture.reportGet(CompletableFuture.java:357)

        at java.util.concurrent.CompletableFuture.get(CompletableFuture.java:1895)

        at io.jenkins.plugins.appcenter.task.UploadTask.call(UploadTask.java:54)

        ... 9 more

Caused by: io.jenkins.plugins.appcenter.AppCenterException: Create upload resource unsuccessful:

        at io.jenkins.plugins.appcenter.task.internal.CreateUploadResourceTask.lambda$execute$0(CreateUploadResourceTask.java:48)

        at java.util.concurrent.CompletableFuture.uniWhenComplete(CompletableFuture.java:760)

        at java.util.concurrent.CompletableFuture$UniWhenComplete.tryFire(CompletableFuture.java:736)

        at java.util.concurrent.CompletableFuture.postComplete(CompletableFuture.java:474)

        at java.util.concurrent.CompletableFuture.completeExceptionally(CompletableFuture.java:1977)

        at retrofit2.CompletableFutureCallAdapterFactory$BodyCallAdapter$2.onResponse(CompletableFutureCallAdapterFactory.java:81)

        at retrofit2.OkHttpCall$1.onResponse(OkHttpCall.java:129)

        at okhttp3.RealCall$AsyncCall.execute(RealCall.java:174)

        at okhttp3.internal.NamedRunnable.run(NamedRunnable.java:32)

        ... 3 more

Caused by: retrofit2.HttpException: HTTP 404 Not Found

        ... 7 more

Build step 'Upload app to AppCenter' changed build result to FAILURE