After switching project: "Unable to determine the provider name"

[StefanAim]

I work on an asp.net project that uses dotConnect for Oracle.
All sources and libraries are under Source Control.

The first version of my project in .net 4.0 used EntityFramework 4 and
dotConnect for Oracle 7.2.122.0
Currently I am in second version in .net 4.5 with EntityFramework 5 and
dotConnect for Oracle 7.7.267.0

Because the first version had an urgent bug, that has to be fixed immediately,
I had to switch back and fix the bug.
Everything is compiling fine, but when I start my project, I get the error
"Unable to determine the provider name for connection of type 'Devart.Data.Oracle.OracleConnection'"

All references are set correct. It worked fine before. For me, it seams, that
I con not switch back to an older version of dotConnect.

[StefanAim]

Hello!

I did not receive any answer until now. The fix is very important and urgent
for us. Thank you for any help.

[Shalex]

1. Which version (x.xx.xxx) of dotConnect for Oracle is currently installed on your workstation?

2. Run your application in the debug mode and make sure (via Visual Studio > Debug > Windows > Modules) that the versions of Devart.* assemblies loaded in the process of your application correspond to the version of dotConnect for Oracle which is registered in the *.config file of your application.
If this doesn't help, please send us a test project so that we can reproduce the issue in our environment.