try
{
   $cms = Get-Content $seqNr-$OutCms-DER-b64 -Raw
   $wsfev1 = New-WebServiceProxy -Uri $WsaaWsdl -ErrorAction Stop
   $wsfev1Response = $wsfev1.FECompUltimoAutorizado($cms) 
   $wsfev1Response > $seqNr-loginTicketResponse.xml 
   $wsfev1Response
}
catch
{
   $errMsg = $_.Exception.Message
   $errMsg > $seqNr-loginTicketResponse-ERROR.xml 
   $errMsg
}