I suggest you remove the references to the following (unless you specifically
need them In this module)

Microsoft forms2.0 objects library
Microsoft ADO Ext. 2.8 for DDL and security
Microsoft HTML object  Library
Outlook object library
Powerpoint Object library

You might need to add

Microsoft Office 11.0 Object Library

I think the problem might be that one of the other libraries also has a chart
object but it does not have the properties/methods you are using.

If you do need the references you might try specifying the chart  in the DIM as
excel.chart