Error 0152: No Entity Framework provider found for 'Oracle.DataAccess.Client' ADO.NET provider

Question

I have Windows 7 x64, Visual Studio 2012 with the 'ODAC 11.2 Release 5 and Oracle Developer Tools for Visual Studio (11.2.0.3.20)'. Then I connected to Oracle db, create .edmx model. But when I'm trying to use EF to operate some data

var ent = new Entities();
var res = ent.table1.ToList();

Error happends

Schema specified is not valid. Errors: 

Model.ssdl(2,2) : error 0152: No Entity Framework provider found for 
'Oracle.DataAccess.Client' ADO.NET provider. Make sure the provider is registered in 
the 'entityFramework' section of the application config file. See 
http://go.microsoft.com/fwlink/?LinkId=260882 for more information.

I checked my AppConfig, all sections are ok. Also I installed ODAC1120320Xcopy_x64 (and added a environment variables too). But nothing changes.

If I do it in this way, all works fine

EntityConnection econn = new EntityConnection("name=Entities");
econn.Open();
EntityCommand ecmd = econn.CreateCommand();
ecmd.CommandText = "SELECT e.NAME FROM Entities.table1 as e";
EntityDataReader ereader = ecmd.ExecuteReader(CommandBehavior.SequentialAccess);
while (ereader.Read()) { ... }

Have you any ideas? Will be very grateful for any help.

Poppo

What EF version are you using (EF5 or EF6)? How does your parameterless ctor look like. Show your config file. – Brachyuran

Hi, Visual Studio is a x86 application, so it is the ODAC 11.2 Release 5 and Oracle Developer Tools for Visual Studio (11.2.0.3.20). Try the following, go to your project-->Properties-->Built-->Platform target. Change it from "Any Cpu" to "x86" and try if it conects in debug mode. If you want to deploy it to a x64 server with the EF x64 you have to change the plattform target. – Workbench