Found this suggestion when I googled:

Then you need to upload to the GAC on the server.

You will need to do the following:

1) Go to Start -> Programs -> Administrative Tools -> Microsoft .NET Framework 2.0 Configuration
(Note if you don't have this you must install the .NET 2 SDK on the server)

2) My Computer -> Assembly Cache

3) Click on: Add an Assembly to the Assembly Cache

4) Browse to the location of the Oracle.DataAccess.dll and add it

You may need to restart your application pool

Now I'm getting another error.

The resource cannot be found.

Description: HTTP 404. The resource you are looking for (or one of its dependencies) could have been removed, had its name changed, or is temporarily unavailable.  Please review the following URL and make sure that it is spelled correctly.

Requested URL: /foo/cuteeditor/cs/default.aspx

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Version Information: Microsoft .NET Framework Version:2.0.50727.42; ASP.NET Version:2.0.50727.210