ExternalParameter = Testing:"C:\Windows\system32\WindowsPowerShell\v1.0\powershell.exe" "C:\Scripts\testing.ps1"
ExternalParameter = Testing2:"C:\Windows\system32\WindowsPowerShell\v1.0\powershell.exe" "C:\Scripts\testing2.ps1"

Testing returns a value but Testing2 produces a communication error.  I have ran testing2.ps1 on the local machine and it returns a value.  I have also ran the testing2.ps1 off of the machine hosting the netxms console.

testing2.ps1

$a = Get-Counter -Computername valandil -Counter "\Network Interface(my adapter goes here)\Bytes Total/sec" -sampleinterval 1 | ForEach-Object{$_.CounterSamples[0].CookedValue}
$b = Get-Counter -Computername valandil -Counter "\Network Interface(my second adapter goes here)\Bytes Total/sec" -sampleinterval 1 | ForEach-Object{$_.CounterSamples[0].CookedValue}

$ab = $a+$b
$ab = "{0:F0}" -f $ab
$ab

I have a need to take two perfmon counters and add them for a single value.  How can I fix the communication issue OR is there a way two add two counters together a different way?