PowerShell module for the F5 LTM REST API

I'm new to using PowerShell and the LTM-REST module and a little help would be appreciated. I'm getting this error when trying to connect to a F5 and get a list of the existing pools. ConvertFrom-Json : Cannot bind argument to parameter 'InputObject' because it is null. At C:\windows\system32\windowspowershell\v1.0\Modules\F5-LTM\1.3.26\Public\Invoke-RestMethodOverride.ps1:36 char:50 + ... $message = $_.ErrorDetails.Message | ConvertFrom-json | Selec ... + ~~~~~~~~~~~~~~~~ + CategoryInfo : InvalidData: (:) [ConvertFrom-Json], ParameterBindingValidationException + FullyQualifiedErrorId : ParameterArgumentValidati NullNotAllowed,Microsoft.PowerShell.Commands.ConvertFromJsonCommand Invoke-RestMethodOverride : "404 Not Found: At C:\windows\system32\windowspowershell\v1.0\Modules\F5-LTM\1.3.26\Public\Get-Pool.ps1:32 char:21 + ... $JSON = Invoke-RestMethodOverride -Method Get -Uri $URI -Credenti ... + ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ + CategoryInfo : NotSpecified: (:) [Write-Error], WriteErrorException + FullyQualifiedErrorId : Microsoft.PowerShell.Commands.WriteErrorException,Invoke-RestMethodOverride And I am not positive whether I am even getting authenticated. This is the script being used: $host_address = "IPAddress_of_F5_Appliance" $user_id = "F5_Account_ID" $secpasswd = "Pasword_Assigned_To_F5_Account_ID" $secpasswd = ConvertTo-SecureString "Pasword_Assigned_To_F5_Account_ID" -AsPlainText -Force $mycreds = New-Object System.Management.Automation.PSCredential ($user_id, $secpasswd) New-F5session -LTMName $host_address -LTMCredentials $mycreds -PassThrough Get-Pool | Select-Object -ExpandProperty fullPath ConvertFrom-Json I'm running PowerShell v.5 Thanks.