The value supplied is not valid, or the property is read-only. Change the value, and then try again.

# Load environment variables from .env file
$envFile = ".env"
if (Test-Path $envFile) {
    $envValues = Get-Content $envFile | ForEach-Object {
        if ($_ -match '\s*([^=]+)\s*=\s*(.+)') {
            $matches[1].Trim(), $matches[2].Trim()
        }
    }
    $envHash = @{}
    for ($i = 0; $i -lt $envValues.Length; $i += 2) {
        $envHash[$envValues[$i]] = $envValues[$i + 1]
    }
}
else {
    Write-Error "Error: .env file not found"
    Exit 1
}
 
# Load WinSCP .NET assembly
Add-Type -Path "C:\Users\vicen\AppData\Local\Programs\WinSCP\WinSCPnet.dll"  # Replace with actual path to WinSCPnet.dll
 
#try {
    # Setup session options
    $sessionOptions = New-Object WinSCP.SessionOptions -Property @{
        Protocol = [WinSCP.Protocol]::Sftp
        HostName = $envHash["HOSTNAME"]
        UserName = $envHash["USERNAME"]
        PortNumber = [int] $envHash["PORT"]
        #SshHostKeyFingerprint = "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAILH4qdAEbpQSMeOtgvaKE5MZHujoO5xyN8V+PdbWfWAz"
    }
 
    if ($envHash["PASSWORD"]) {
        $sessionOptions.Password = ConvertTo-SecureString $envHash["PASSWORD"] -AsPlainText -Force
    }
    elseif ($envHash["PRIVATE_KEY_PATH"]) {
        $sessionOptions.SshPrivateKeyPath = $envHash["PRIVATE_KEY_PATH"]
    }
    else {
        Write-Error "Error: Password or private key path not provided in .env file"
        Exit 1
    }
 
    $session = New-Object WinSCP.Session
 
    try {
        # Connect
        $session.Open($sessionOptions)
 
        # Upload files
        $transferOptions = New-Object WinSCP.TransferOptions
        $transferOptions.TransferMode = [WinSCP.TransferMode]::Binary
 
        $transferResult = $session.PutFiles($envHash["LOCAL_FILE"], $envHash["REMOTE_DIR"], $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()
    }
 
#}
#catch {
#    Write-Host ("Error: {0}" -f $_.Exception.Message)
#    Exit 1
#}