windows - Method not found: 'System.Threading.Tasks.Task System.Threading.Tasks.Task.Run(System.Action)' -

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i have uninstalled .net 4.5 , installed 4.0. now, powershell not working. opening , closing itself. below error getting. suggestions please :-

method not found: 'system.threading.tasks.task system.threading.tasks.task.run(system.action)'

thanks in advance !!





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