Entity Framework Exception: Schema specified is not valid. for oracle

I working in Asp.net with entity framework in vs 2010 with oracle database. I provide connection string from code for entity frame work datacontext. Here is my code:

public static string getConStrSQL()
    {

        //string connectionString = new System.Data.EntityClient.EntityConnectionStringBuilder
        string connectionString = new System.Data.EntityClient.EntityConnectionStringBuilder
        {
            Metadata = "res://*",
            Provider = "Oracle.ManagedDataAccess.Client",
            //Provider = "Oracle.DataAccess.Client",
            ProviderConnectionString = new System.Data.SqlClient.SqlConnectionStringBuilder
            {
                //InitialCatalog = "ORCL",
                DataSource = "MONOJ-PC:1521/ORCL",
                //IntegratedSecurity = false,
                UserID = "C##MONOJ",                 // User ID such as "sa"
                Password = "Thanks123",               // hide the password
            }.ConnectionString
        }.ConnectionString;

        return connectionString;
    }

    public List<CUSTOMER> GetCustomerList()
    {

        using (Entities db = new Entities())
        {
            db.Connection.ConnectionString = getConStrSQL();
            db.Connection.Open();

            var data = from p in db.CUSTOMERs
                       select p;

            db.Connection.Close();

            return data.ToList();
        }
    }

But when i run the Code i get Following errors:

Schema specified is not valid. Errors: error 0194: All artifacts loaded into an ItemCollection must have the same version. Multiple versions were encountered. DAL.DBModel.ssdl(2,46) : error 0172: All SSDL artifacts must target the same provider. The Provider 'Oracle.DataAccess.Client' is different from 'Oracle.DataAccess.Client' that was encountered earlier. DAL.DBModel.ssdl(2,89) : error 0169: All SSDL artifacts must target the same provider. The ProviderManifestToken '12.1' is different from '9.2' that was encountered earlier. Oracle.ManagedDataAccess.src.EntityFramework.Resources.EFOracleStoreSchemaDefinition.ssdl(3,4) : error 0019: The EntityContainer name must be unique. An EntityContainer with the name 'Schema' is already defined. Oracle.ManagedDataAccess.src.EntityFramework.Resources.EFOracleStoreSchemaDefinition.ssdl(834,4) : error 0019: Each type name in a schema must be unique. Type name 'Oracle.Table' was already defined. Oracle.ManagedDataAccess.src.EntityFramework.Resources.EFOracleStoreSchemaDefinition.ssdl(844,4) : error 0019: Each type name in a schema must be unique. Type name 'Oracle.TableColumn' was already defined. Oracle.ManagedDataAccess.src.EntityFramework.Resources.EFOracleStoreSchemaDefinition.ssdl(870,4) : error 0019: Each type name in a schema must be unique. Type name 'Oracle.View' was already defined. Oracle.ManagedDataAccess.src.EntityFramework.Resources.EFOracleStoreSchemaDefinition.ssdl(882,4) : error 0019: Each type name in a schema must be unique. Type name 'Oracle.ViewColumn' was already defined. Oracle.ManagedDataAccess.src.EntityFramework.Resources.EFOracleStoreSchemaDefinition.ssdl(908,4) : error 0019: Each type name in a schema must be unique. Type name 'Oracle.Function' was already defined. Oracle.ManagedDataAccess.src.EntityFramework.Resources.EFOracleStoreSchemaDefinition.ssdl(933,4) : error 0019: Each type name in a schema must be unique. Type name 'Oracle.Procedure' was already defined. Oracle.ManagedDataAccess.src.EntityFramework.Resources.EFOracleStoreSchemaDefinition.ssdl(943,4) : error 0019: Each type name in a schema must be unique. Type name 'Oracle.Parameter' was already defined. Oracle.ManagedDataAccess.src.EntityFramework.Resources.EFOracleStoreSchemaDefinition.ssdl(967,4) : error 0019: Each type name in a schema must be unique. Type name 'Oracle.Constraint' was already defined. Oracle.ManagedDataAccess.src.EntityFramework.Resources.EFOracleStoreSchemaDefinition.ssdl(979,4) : error 0019: Each type name in a schema must be unique. Type name 'Oracle.CheckConstraint' was already defined. Oracle.ManagedDataAccess.src.EntityFramework.Resources.EFOracleStoreSchemaDefinition.ssdl(987,4) : error 0019: Each type name in a schema must be unique. Type name 'Oracle.ConstraintColumn' was already defined. Oracle.ManagedDataAccess.src.EntityFramework.Resources.EFOracleStoreSchemaDefinition.ssdl(996,4) : error 0019: Each type name in a schema must be unique. Type name 'Oracle.ForeignKeyConstraint' was already defined. Oracle.ManagedDataAccess.src.EntityFramework.Resources.EFOracleStoreSchemaDefinition.ssdl(1005,4) : error 0019: Each type name in a schema must be unique. Type name 'Oracle.ForeignKey' was already defined. Oracle.ManagedDataAccess.src.EntityFramework.Resources.EFOracleStoreSchemaDefinition.ssdl(1016,4) : error 0019: Each type name in a schema must be unique. Type name 'Oracle.ViewConstraint' was already defined. Oracle.ManagedDataAccess.src.EntityFramework.Resources.EFOracleStoreSchemaDefinition.ssdl(1031,4) : error 0019: Each type name in a schema must be unique. Type name 'Oracle.TableTableConstraint' was already defined. Oracle.ManagedDataAccess.src.EntityFramework.Resources.EFOracleStoreSchemaDefinition.ssdl(1044,4) : error 0019: Each type name in a schema must be unique. Type name 'Oracle.ConstraintConstraintColumn' was already defined. Oracle.ManagedDataAccess.src.EntityFramework.Resources.EFOracleStoreSchemaDefinition.ssdl(1057,4) : error 0019: Each type name in a schema must be unique. Type name 'Oracle.ConstraintForeignKey' was already defined. Oracle.ManagedDataAccess.src.EntityFramework.Resources.EFOracleStoreSchemaDefinition.ssdl(1070,4) : error 0019: Each type name in a schema must be unique. Type name 'Oracle.FromForeignKeyColumn' was already defined. Oracle.ManagedDataAccess.src.EntityFramework.Resources.EFOracleStoreSchemaDefinition.ssdl(1083,4) : error 0019: Each type name in a schema must be unique. Type name 'Oracle.ToForeignKeyColumn' was already defined. Oracle.ManagedDataAccess.src.EntityFramework.Resources.EFOracleStoreSchemaDefinition.ssdl(1096,4) : error 0019: Each type name in a schema must be unique. Type name 'Oracle.TableTableColumn' was already defined. Oracle.ManagedDataAccess.src.EntityFramework.Resources.EFOracleStoreSchemaDefinition.ssdl(1109,4) : error 0019: Each type name in a schema must be unique. Type name 'Oracle.ViewViewColumn' was already defined. Oracle.ManagedDataAccess.src.EntityFramework.Resources.EFOracleStoreSchemaDefinition.ssdl(1122,4) : error 0019: Each type name in a schema must be unique. Type name 'Oracle.FunctionFunctionParameter' was already defined. Oracle.ManagedDataAccess.src.EntityFramework.Resources.EFOracleStoreSchemaDefinition.ssdl(1135,4) : error 0019: Each type name in a schema must be unique. Type name 'Oracle.ProcedureProcedureParameter' was already defined. Oracle.ManagedDataAccess.src.EntityFramework.Resources.EFOracleStoreSchemaDefinition.ssdl(1148,4) : error 0019: Each type name in a schema must be unique. Type name 'Oracle.ViewViewConstraint' was already defined. Oracle.ManagedDataAccess.src.EntityFramework.Resources.EFOracleStoreSchemaDefinition.ssdl(1161,4) : error 0019: Each type name in a schema must be unique. Type name 'Oracle.ViewConstraintConstraintColumn' was already defined. Oracle.ManagedDataAccess.src.EntityFramework.Resources.EFOracleStoreSchemaDefinition.ssdl(1174,4) : error 0019: Each type name in a schema must be unique. Type name 'Oracle.ViewConstraintForeignKey' was already defined. Oracle.ManagedDataAccess.src.EntityFramework.Resources.EFOracleStoreSchemaDefinition.ssdl(1187,4) : error 0019: Each type name in a schema must be unique. Type name 'Oracle.FromForeignKeyViewColumn' was already defined. Oracle.ManagedDataAccess.src.EntityFramework.Resources.EFOracleStoreSchemaDefinition.ssdl(1200,4) : error 0019: Each type name in a schema must be unique. Type name 'Oracle.ToForeignKeyViewColumn' was already defined.

I googled but can not get any answer. Please, Help me. It's argent.

Bye-

With regards

Sadequzzaman Monoj

Bangladesh