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I know nothing about .net stored procedures, which is what it looks like you're trying to do. That said, the most common cause of this error is the bit-ness of the thing you're compiling not matching that of Oracle. If you're deploying to an x64 server, you might want to set the project's build properties to x64 to ensure that's what you get. (The ODAC version with the developer tools is 32 bit, so you may also need a 64 bit Oracle client on your development system to get things working, but as I said I've never done anything with .net stored procedures so I'm kind of guessing there.)
Thank you. You need to make sure that the target platform is the same and that the Oracle.DataAccess version matches the server.