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运行Powershell脚本时出现以下错误消息

The property 'value' cannot be found on this object. Verify that the property exists and can be set.
At C:\Test.ps1:17 char:1
+ $usernamefield.value = $username
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : InvalidOperation: (:) [], RuntimeException
    + FullyQualifiedErrorId : PropertyAssignmentException

The property 'value' cannot be found on this object. Verify that the property exists and can be set.
At C:\Test.ps1:20 char:1
+ $passwordfield.value = $password
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : InvalidOperation: (:) [], RuntimeException
    + FullyQualifiedErrorId : PropertyAssignmentException

Method invocation failed …