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The task XML contains a value which is incorrectly formatted or out of range

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sharing a quick fix as I couldn't find easily information on how to get rid of this error. This also prevents from adding/deleting new tasks to the system. In my case it was a orphaned task so it was easy to get rid of this failure

You can check "C:\Windows\System32\Tasks" and get the above XML. as mine was orphaned I went ahead and removed the XML (=task) file from this folder and I could again access "Task Scheduler" MMC or via Powershell

Task Scheduler Schema

https://msdn.microsoft.com/en-us/library/windows/desktop/aa383609(v=vs.85).aspx