Windows App Certification Kit: Background tasks cancelation handler validation detected the following errors

FAILED Background tasks cancelation handler

•Error Found: The background tasks cancelation handler validation detected the following errors:◦System.ArgumentException: Process with an Id of 354340 is not running. at System.Diagnostics.Process.GetProcessById(Int32 processId, String machineName) at Microsoft.Windows.SoftwareLogo.Shared.ProcessUtility.LaunchProcessUnelevated(String exePath, String commandLineArguments, Int32 waitTime, Boolean createNewConsole, Int32& exitCode, String logIdConstant) at Microsoft.Windows.SoftwareLogo.Shared.AppxUtility.LaunchStoreApp(String appUserModelId) at Microsoft.Windows.SoftwareLogo.Tests.CancelationHandlerValidation.CancelationHandlerValidation.ExecuteSharedValidation(String manifestFilePath, String packageFullName) at Microsoft.Windows.SoftwareLogo.TestBase.TestBase.ExecuteTest() ◦[HRESULT: 0x80131604]. Test operation failed: 'ExecuteTest'.

•Impact if not fixed: An app that fails to handle cancelation request to background tasks, which will result in being force terminated.

•How to fix: Background tasks need to implement cancelation event handler.

Any one that can help me fix this, i dont understand the suggested "how to fix"