This issue happens sometimes when I am trying to upload APK using the Jenkins app-center plugin, this is my config in the Jenkins file

 appCenter apiToken: appCenterToken,
 ownerName: appCenterOwn,
 appName: releaseEnv.appCenterName,
 pathToApp: releaseEnv.apkPath,
 distributionGroups: 'Collaborators',
 pathToReleaseNotes: releaseEnv.releaseNotesPath
 

io.jenkins.plugins.appcenter.AppCenterException: Create upload resource for app unsuccessful: HTTP 400 : {"status":400,"name":"Error","message":"Missing required body parameter \"body\""}12:43:55 at io.jenkins.plugins.appcenter.AppCenterLogger.logFailure(AppCenterLogger.java:23)12:43:55 at io.jenkins.plugins.appcenter.AppCenterLogger.logFailure(AppCenterLogger.java:37)12:43:55 at io.jenkins.plugins.appcenter.task.internal.CreateUploadResourceTask.lambda$createUploadResourceForApp$0(CreateUploadResourceTask.java:59)