powershell 运行脚本出错，该如何处理

powershell 运行脚本出错，
........

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$anError = $false;

[Reflection.Assembly]::LoadFile($psh + "\dll\Oracle.DataAccess.dll")

$conn= New-Object Oracle.DataAccess.Client.OracleConnection($oracleConstr);
$conn.Open();

#the first thing is lookup connection information for VCenter Server:
$sql = "SELECT sc.scsystem, sc.scIP, sc.scAccount, sc.scPassword FROM SystemConfigure sc WHERE sc.scsystem = 'vcenter'" + 
" OR sc.scsystem = 'firewall'" +
" OR sc.scsystem = 'unix command gateway'" ;

$vcenter = $null;
$unixServer = $null;
$firewall = $null;

.........


此脚本是在windows2003虚拟机里运行的，功能是用来产出虚拟机的，调用脚本执行。powershell脚本连接oracle数据库是ok的，调用dll\Oracle.DataAccess.dll文件也没有问题，但是连接后，走到$conn.Open()的时候报如下的错误。各位大虾看到后说下原因，在线跪求。。。

GAC Version Location  
--- ------- --------  
True v2.0.50727 C:\WINDOWS\assembly\GAC_32\Oracle.DataAccess\2.102.2.20__89b483f429c47342\Oracle.DataAccess.dll  
Exception calling "Open" with "0" argument(s): ""
At E:\powerShellScript\CreateVirtualMachineByVMOrderID.ps1:71 char:11
+ $conn.Open <<<< ();
  + CategoryInfo : NotSpecified: (:) [], MethodInvocationException
  + FullyQualifiedErrorId : DotNetMethodException
 

------解决方案--------------------
上午在oracle 11g上碰到了点别的问题，搞定了，代码如下：

功能：连接oracle查询表并显示表记录，显示字段描述：

Python code

# Load the ODP assembly 
[Reflection.Assembly]::LoadFile("C:\oracle\product\11.2.0\dbhome_1\ODP.NET\bin\2.x\Oracle.DataAccess.dll")

#connect to Oracle 
$constr = "User Id=scott;Password=1111111;Data Source=orcl"
$conn= New-Object Oracle.DataAccess.Client.OracleConnection($constr)
$conn.Open()

# Create a datareader for a SQL statement 
$sql="select deptno,dname,loc from dept"
$command = New-Object Oracle.DataAccess.Client.OracleCommand( $sql,$conn)
$reader=$command.ExecuteReader()

#loop through recordset
while ($reader.read()){
    #assign variables from recordset
    $objdeptno=$reader.GetInt16(0)
    $objdname=$reader.GetString(1)
    $objloc=$reader.GetString(2)
    
    Write-Host $objdeptno
    Write-Host $objdname
    Write-Host $objloc
    Write-Host "====="
}

# Write out the result set structure 
Write-Host "fields:====="
for ($i=0;$i -lt $reader.FieldCount;$i++) {
    Write-Host  $reader.GetName($i) $reader.GetDataTypeName($i) 
}

$conn.Close()