我做毕业设计，用VB.NET设计界面，打开pre/e的模型，但是一直错误，求指点
Imports pfcls
Imports System.Reflection.Assembly
Public Class 建模
Public asyncConnection As IpfcAsyncConnection
Public cac As CCpfcAsyncConnection
Dim model As IpfcModel
Public parameterOwner As IpfcParameterOwner
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Dim cac As CCpfcAsyncConnection
cac = New CCpfcAsyncConnection
asyncConnection = cac.Start("D:\Program Files\proeWildfire 4.0\bin\proe1.bat", ".")
Dim proeid As IpfcAsyncConnection
proeid = (New CCpfcAsyncConnection).Connect(Nothing, Nothing, Nothing, Nothing)
End Sub
Private Sub Button3_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button3.Click
Dim descModel As IpfcModelDescriptor
Dim options As IpfcRetrieveModelOptions
Dim session As IpfcBaseSession
Dim currentws As Object
session = asyncConnection.Session
options = (New CCpfcRetrieveModelOptions).Create
options.AskUserAboutReps = False
session.ChangeDirectory("D:\ZY")
descModel = (New CCpfcModelDescriptor).Create(EpfcModelType.EpfcMDL_PART, Nothing, Nothing)
descModel.Path = "D:\ZY\asm0001.asmt"
model = asyncConnection.Session.RetrieveModelWithOpts(descModel, options)
session.CreateModelWindow(model)
currentws = session.GetCurrentWS()
model.Display()
End Sub
