ODP.NET

This is my error:
The provider is not compatible with the version of Oracle client

I've installed Oracle Client (c:\oracle\product\10.2.0)
I've installed ODTwithODAC112030 (c:\app\IR_BABOON\product\11.2.0)
I've added the file: C:\app\IR_BABOON\product\11.2.0\client_1\odp.net\bin\2.x\Oracle.DataAccess.dll as the reference to the .net project. The same file is also added to my GAC

I temporarily inherited an application which is .net2

The way I read the problem is that my new version of odp.net isn't compatible with my oracle client. Would that be a fair summary?
I think I've 2 options:
1) remove the odp.net and install an older one?
2) remove the oracle client then add an updated oracle client?

Thanks for the help. Perhaps there is a chart showing what oralce clients are compatible with what odp.net...