Adding columns to all Families in a content center library

[mslosar]

We are moving to new internal systems and i'm going to have to add several columns to all of our content center libraries. I'm trying to do this via ilogic so i don't have to open a few hundred libraries to do this.  I can loop through the families, but it keeps throwing errors adding a column.  The error is that clear as mud 'the parameter is incorrect'.  It's at the TableColumns.Add line...what am i missing here?

Public Sub Main()

        Dim oContentCenter As ContentCenter
        oContentCenter = ThisApplication.ContentCenter

        Dim a As ContentTreeViewNode
        a = oContentCenter.TreeViewTopNode

        Call LoopGetFromTreeView(a)
    End Sub

Private Sub LoopGetFromTreeView(oContentTreeViewNode As ContentTreeViewNode)

        Dim oContentTreeViewNodeLoop As ContentTreeViewNode     
        Dim strPath As String
        strPath = oContentTreeViewNode.FullTreeViewPath
        Dim strFam As String
        strFam = oContentTreeViewNode.DisplayName
        Dim strExport As String
        strExport = oContentTreeViewNode.DisplayName

        Dim oContentFamily As ContentFamily
        For Each oContentFamily In oContentTreeViewNode.Families
			'do something here
			MessageBox.Show(oContentFamily.DisplayName)			
			
			MessageBox.Show("2")
			
    		oContentFamily.TableColumns.Add("Item Group", "Item Group [Custom]", ValueTypeEnum.kStringType)
			
			MessageBox.Show("3")
   			
    		'modify cell
    		Dim oRow As ContentTableRow
    		For Each oRow In oContentFamily.TableRows
                		
        		oRow.Item("Item Group").Value = "Purchase Lot -100030"
        		
    		Next
    
    		'save change
    		Call oContentFamily.Save

        Next

        For Each oContentTreeViewNodeLoop In oContentTreeViewNode.ChildNodes

          Call LoopGetFromTreeView(oContentTreeViewNodeLoop)

        Next
    End Sub

[mslosar · Accepted solution]

So, It would appear the internal name can't have a space. I changed "Item Group" to "ItemGroup" and it works.