[Zope] More from error messages?

Is there any way to get more information from an error message? I have the following message: Error Type: AttributeError Error Value: 'string' object has no attribute 'filename' But I don't know what variable it is talking about. If you pass a variable into a python script from Zope, and the variable is a file passed from an "attach" html tag, will it still be a file when python gets it? Is it all just one big string? Any help here would be great... Thanks! Donner