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Please make sure the person approving the item have enough rights on the list. If you are using a task list, approver would require contribute permission on it, else how would he be able to modify the status of the task.


It's because $lista is $null. Are you sure this is correct title of the list? In PowerShell you won't get error when you try load list with incorrect title. You also won't get exception executing follofing: $null.Something foreach ($a in $null) {} That's why you get an exception so late, on the Update() method. You should also use Get-SPSite instead of ...


I think you should check on 2 things In $item["title"] you should use casing, because SharePoint understands Title hence improve it to $item["Title"]. I guess you don't need $lista.update() Refer below updated code. #Add SharePoint PowerShell Snapin which adds SharePoint specific cmdlets Add-PSSnapin Microsoft.SharePoint.PowerShell -EA SilentlyContinue ...

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