PowerShell module for the F5 LTM REST API

Hi! I am getting an error: PS C:\Users\user-1> Get-Pool | Select-Object -ExpandProperty fullPath ConvertFrom-Json : Cannot bind argument to parameter 'InputObject' because it is null. At C:\Users\user-1\Documents\WindowsPowerShell\Modules\F5-LTM\Public\Invoke-RestMethodOverride.ps1:29 char:50 + $message = $_.ErrorDetails.Message | ConvertFrom-json | Select-Objec ... + ~~~~~~~~~~~~~~~~ + CategoryInfo : InvalidData: (:) [ConvertFrom-Json], ParameterBindingValidationException + FullyQualifiedErrorId : ParameterArgumentValidati NullNotAllowed,Microsoft.PowerShell.Commands.ConvertFrom JsonCommand Invoke-RestMethodOverride : "401 F5 Authorization Required: Failed to get the /*/*' pool(s). At C:\Users\user-1\Documents\WindowsPowerShell\Modules\F5-LTM\Public\Get-Pool.ps1:28 char:21 + $JSON = Invoke-RestMethodOverride -Method Get -Uri $Uri -Credential ... + ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ + CategoryInfo : NotSpecified: (:) [Write-Error], WriteErrorException + FullyQualifiedErrorId : Microsoft.PowerShell.Commands.WriteErrorException,Invoke-RestMethodOverride PS C:\Users\user-1> Please advise