Get-WmiObject : Invalid class error in Citrix XenApp

In the Citrix XenApp app, there is no session information displayed.

Upon running the script manually, the below error is given:

C:\>powershell.exe -command  " &'c:\program files\splunkuniversalforwarder\etc\a
pps\TA-XA65-Server\bin\powershell\GetICASessionStat65.ps1'"
Get-WmiObject : Invalid class
At C:\program files\splunkuniversalforwarder\etc\apps\TA-XA65-Server\bin\powers
hell\GetICASessionStat65.ps1:2 char:29
+ $ICASessions = Get-WMIOBject <<<<  -Class Win32_PerfFormattedData_CitrixICA_I
CASession
    + CategoryInfo          : InvalidOperation: (:) [Get-WmiObject], Managemen
   tException
    + FullyQualifiedErrorId : GetWMIManagementException,Microsoft.PowerShell.C
   ommands.GetWmiObjectCommand

What is causing the issue?