Automation - powershell - host key not verified

PS c:\Program Files (x86)\WinSCP> powershell c:\myscript.ps1

try
{
    # Load WinSCP .NET assembly
    [Reflection.Assembly]::LoadFrom("WinSCP.dll") | Out-Null
 
    # Setup session options
    $sessionOptions = New-Object WinSCP.SessionOptions
    $sessionOptions.Protocol = [WinSCP.Protocol]::Sftp
    $sessionOptions.HostName = "xxx.xxx.xxx.xxx"
    $sessionOptions.UserName = "my_user"
    $sessionOptions.Password = "my_password"
    $SessionOptions.SshPrivateKeyPath = "c:\my_private_key.ppk"
    $sessionOptions.SshHostKeyFingerprint = "ssh-rsa 1023 95:5d:61:f4:c3:bb:1d:54:29:0e:55:6d:e5:c1:c8:26"
 
    $session = New-Object WinSCP.Session
 
    try
    {
        # Connect
        $session.Open($sessionOptions)
 
        # Upload files
        $transferOptions = New-Object WinSCP.TransferOptions
        $transferOptions.TransferMode = [WinSCP.TransferMode]::Binary
 
        $transferResult = $session.PutFiles("c:\testfile.txt", "./", $FALSE, $transferOptions)
 
        # Throw on any error
        $transferResult.Check()
 
        # Print results
        foreach ($transfer in $transferResult.Transfers)
        {
            Write-Host ("Upload of {0} succeeded" -f $transfer.FileName)
        }
    }
    finally
    {
        # Disconnect, clean up
        $session.Dispose()
    }
 
    exit 0
}
catch [Exception]
{
    Write-Host $_.Exception.Message
    exit 1
}

The host key was not verified