System.Exception: null or empty values

Have designed a 4 part form Using DW MX, ASP.NET C# and MySQL
and currently getting the below error when moving from one page to
the next.
The web.config file is on the server, there are no null or
empty values, and the key tags match.
I am new to applicaiton development in DW and am now stuck -
any suggestions?
System.Exception: This page has a MM:DataSet, MM:Insert,
MM:Update or MM:Delete tag with a null or empty value for the
ConnectionString and DatabaseType attributes.
Often, such values come from application settings in the
web.config file. That file might be missing from the server
executing this page. Or, it might be missing the particular add key
tags for the database connection this page uses. If you are using
Dreamweaver, look for the web.config file in the local root folder
of your Dreamweaver site. Once you find this file, you can either:
Put this file onto the server that is executing this page.
Copy the add key tags from the web.config in the local root
folder of your Dreamweaver site and paste them into the web.config
file in the server that is executing this page.
at DreamweaverCtrls.DataSet.DoInit()
Text

http://java.sun.com/docs/books/tutorial/uiswing/components/spinner.html#model
Might be a good start.

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