Error: "Object reference not set to any instance of an object"

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Symptoms The error message "Object reference not set to any instance of an object" appears when clicking OK on the Scheduled Task Credentials screen.
Cause This is a permissions issue.
Resolution
The local administrators group be granted Full Control for the Tasks folder. 
 
To grant Full Control of the Tasks folder, perform the following steps:
  1. Navigate to C:\Windows\Tasks folder. 
  2. Right-click the folder and select Properties
  3. Select Security tab. 
  4. Select the Administrators group and check Allow next to Full Control.
  5. Click Apply.

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