Hi need help calling the post to logout

[Mordath]

Need help with logout call here is code:

$Header = @{
"AuthToken" = $response.auth_token
}

Invoke-RestMethod -Uri "https://$Server/api/logout" -Method Post -Headers $Header

Getting this

Invoke-RestMethod :
{"result":[{"code":"0","message":"php function call with incorrect parameter type","link":"http://kb.unitrends.com"}]}
At C:\Users\User\Scripts\Unitrends\Unitrends Logout.ps1:17 char:1

• Invoke-RestMethod -Uri "https://$Server/api/logout" -Method Post -Hea ...

•   + CategoryInfo          : InvalidOperation: (System.Net.HttpWebRequest:HttpWebRequest) [Invoke-RestMethod], WebException
    + FullyQualifiedErrorId : WebCmdletWebResponseException,Microsoft.PowerShell.Commands.InvokeRestMethodCommand