Set-SwisObject : The given key was not present in the dictionary.

Hi, I try to update Alias/Comments for IP but I get error: Set-SwisObject : The given key was not present in the dictionary.

Import-Module SwisPowerShell

[String]$swisConnectHost = 'localhost'

[String]$swisConnectUserName = 'admin'

[String]$swisConnectPassword = ''

[String]$targetSubnet = '10.0.0.0'

[String]$targetSubnetCIDR = '24'

[string]$IPHostname = 'VM-test-01'

[string]$IPComments = 'Reserved by ServiceNow'

$swis = Connect-Swis -UserName $swisConnectUserName -Password $swisConnectPassword -Hostname $swisConnectHost

$IP = Invoke-SwisVerb $swis IPAM.SubnetManagement StartIpReservation @($targetSubnet, $targetSubnetCIDR, "0") -Verbose

try {

    Invoke-SwisVerb -SwisConnection $swis -EntityName IPAM.SubnetManagement -Verb ChangeIpStatus @($IP, "Blocked") -Verbose

} Catch {

    $_.Exception.ExceptionMessage

}

try {

    Invoke-SwisVerb -SwisConnection $swis -EntityName IPAM.SubnetManagement -Verb FinishIpReservation @($IP, "Reserved") -Verbose

} Catch {

    $_.Exception.ExceptionMessage

}

$IPtoIdQuery = "SELECT IpNodeId FROM IPAM.IPNode where IPAddress like '"+ $($Ip.'#text') +"'"

$IPAMNode =  Get-SwisData -SwisConnection $swis -Query $IPtoIdQuery

$URI = 'swis://localhost/Orion/IPAM.IPNode/IpNodeId='+$IPAMNode

# Setting IP Node properties needed Admin rights

Set-SwisObject $swis -Uri $URI -Properties @{ Comments = $IPComments }

It's very simple operation, I don't know what is wrong. Please help.