Created Unassigned: Test-WebServerSSL.ps1:26 char:2 [73]

I tried to test basic functionality with Test-WebServerSSL, but I got this error:

Exception calling "SendRequest" with "0" argument(s): "Object reference not set to an instance of an object."
At C:\Windows\system32\WindowsPowerShell\v1.0\Modules\PSPKI\Client\Test-WebServerSSL.ps1:26 char:2
+ $Response.SendRequest()
+ ~~~~~~~~~~~~~~~~~~~~~~~
+ CategoryInfo : NotSpecified: (:) [], MethodInvocationException
+ FullyQualifiedErrorId : NullReferenceException