How to use Powershell with Crystal Decisions

Hi,

i would like to use Powershell with Crystal Decisions for exporting crystal reports. Unfortunately i have a problem.
If i save my report without saved data to force an update of the report with new parameters i get the following error:

I guess its something about connecting to the sybase database because when i run my script with a report with saved data it works.

Does anybody know this behaviour?

Thank you!!

CRRuntime_64bit_13_0_12

Crystal Reports 2008

My code:

Param(

  [string]$FirstName1

)

[reflection.assembly]::LoadWithPartialName('CrystalDecisions.Shared')

[reflection.assembly]::LoadWithPartialName('CrystalDecisions.CrystalReports.Engine')

$report = New-Object CrystalDecisions.CrystalReports.Engine.ReportDocument

$report.Load("C:\Users\geservice\Desktop\shell\Textbefund.rpt")

foreach ($Table in $report.Database.Tables)           

    {           

        $table           

        $tli = $Table.LogonInfo           

        $li = $tli.ConnectionInfo           

        Write-host "location : $($table.location)"          

        $li.ServerName = "myserver"           

        $li.DatabaseName = "mydb"            

        $li.UserID = "user"           

        $li.Password = "password"  

        $Table.ApplyLogOnInfo($tli)           

        $table.location            

    }  

$report.SetParameterValue("FirstName",$FirstName1)

$report.ExportToDisk("Text","C:\Users\geservice\Desktop\shell\Textbefund.txt")

$report.close()