Why do I get the error: System.Runtime.InteropServices.COMException? - vb.net

Question

I am using VB.NET to Create Labels in Microsoft. This is my code:
Public Sub CreateLabel(ByVal StrFilter As String, ByVal Path As String)
WordApp = CreateObject("Word.Application")
''Add a new document.
WordDoc = WordApp.Documents.Add()
Dim oConn As SqlConnection = New SqlConnection(connSTR)
oConn.Open()
Dim oCmd As SqlCommand
Dim oDR As SqlDataReader
oCmd = New SqlCommand(StrFilter, oConn)
oDR = oCmd.ExecuteReader
Dim intI As Integer
Dim FilePath As String = ""
With WordDoc.MailMerge
With .Fields
Do While oDR.Read
For intI = 0 To oDR.FieldCount - 1
.Add(WordApp.Selection.Range, oDR.Item(intI))
Next
Loop
End With
Dim objAutoText As Word.AutoTextEntry = WordApp.NormalTemplate.AutoTextEntries.Add("MyLabelLayout", WordDoc.Content)
WordDoc.Content.Delete()
.MainDocumentType = Word.WdMailMergeMainDocType.wdMailingLabels
FilePath = CreateSource(StrFilter)
.OpenDataSource(FilePath)
Dim NewLabel As Word.CustomLabel = WordApp.MailingLabel.CustomLabels.Add("MyLabel", False)
WordApp.MailingLabel.CreateNewDocument(Name:="MyLabel", Address:="", AutoText:="MyLabelLayout")
objAutoText.Delete()
.Destination = Word.WdMailMergeDestination.wdSendToNewDocument
WordApp.Visible = True
.Execute()
End With
oConn.Close()
WordDoc.Close()
End Sub
Private Function CreateSource(ByVal StrFilter As String) As String
Dim CnnUser As SqlConnection = New SqlConnection(connSTR)
Dim sw As StreamWriter = File.CreateText("C:\Mail.Txt")
Dim Path As String = "C:\Mail.Txt"
Dim StrHeader As String = ""
Try
Dim SelectCMD As SqlCommand = New SqlCommand(StrFilter, CnnUser)
Dim oDR As SqlDataReader
Dim IntI As Integer
SelectCMD.CommandType = CommandType.Text
CnnUser.Open()
oDR = SelectCMD.ExecuteReader
For IntI = 0 To oDR.FieldCount - 1
StrHeader &= oDR.GetName(IntI) & " ,"
Next
StrHeader = Mid(StrHeader, 1, Len(StrHeader) - 2)
sw.WriteLine(StrHeader)
sw.Flush()
sw.Close()
StrHeader = ""
Do While oDR.Read
For IntJ As Integer = 0 To oDR.FieldCount - 1
StrHeader &= oDR.GetString(IntJ) & " ,"
Next
Loop
StrHeader = Mid(StrHeader, 1, Len(StrHeader) - 2)
sw = File.AppendText(Path)
sw.WriteLine(StrHeader)
CnnUser.Close()
sw.Flush()
sw.Close()
Catch ex As Exception
MessageBox.Show(ex.Message, "TempID", MessageBoxButtons.OK, MessageBoxIcon.Error)
End Try
Return Path
End Function
Now when I am running the program I am getting this error. I tried hard but not able to locate what could be the problem the error is:
System.Runtime.InteropServices.COMException -->Horizontal and vertical
pitch must be greater than or equal to the label width and height,
respectively.
Even though I tried to set the Horizontal and vertical pitch programatically it gives same error.

Answer 1

Make sure that you have a default printer set up for the user account that the application runs under. Might not be relevant but I have had various unusual problems following that omission.

Answer 2

Did you install the Office Primary Interop Assemblies? (Appropriately abbreviated to PIA)
Try this