我的问题是我编写了一个启动Exchange外壳PS会话的脚本。如果我在PowerShell中逐行执行脚本，或者在资源管理器中右击并运行它，脚本运行得很好。但是，当在生成新证书后通过Certify调用它时，它将失败。
以下是该脚本的部分内容：

$password = Get-Content -Path 'c:\Certificate_Update\securepassword.txt'
$pw = ConvertTo-SecureString -String $password

# $pw = ConvertTo-SecureString -AsPlainText -Force -String "admin pass here"

$cred = New-Object System.Management.Automation.PSCredential ("Wookies-Domain\Administrator", $pw)
$uri = 'http://Exchange-Server/PowerShell/'

# Starts remote Exchange shell session

$Session = New-PSSession -ConfigurationName Microsoft.Exchange -ConnectionUri $uri -Authentication Kerberos -Credential $Cred

# Imports remote Exchange shell session to this Machine

Import-PSSession $Session

我得到的错误是：

ConvertTo-SecureString : The system cannot find the path specified.

At C:\Certificate_Update\Update_Old_Cert.ps1:40 char:7
+ $pw = ConvertTo-SecureString -String $password
+       ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : InvalidArgument: (:) [ConvertTo-SecureString], CryptographicException
    + FullyQualifiedErrorId :  ImportSecureString_InvalidArgument_CryptographicError,Microsoft.PowerShell.Commands.ConvertToSecureStringCommand

TerminatingError(New-Object): "Exception calling ".ctor" with "2" argument(s):
"Cannot process argument because the value of argument "password" is null.
Change the value of argument "password" to a non-null value.""

New-Object : Exception calling ".ctor" with "2" argument(s): "Cannot process
argument because the value of argument "password" is null. Change the value of
argument "password" to a non-null value."

是不是说$password为空？我不知道我做错了什么。脚本正在由Certify运行，这可能是权限问题吗？