ORA-00604 & ORA-08177 with entity framework

[ben2207]

hello all
i have created a new project MVC5 in visual studio 2012 ultimate, all model class (Banque, Client,...etc), and entity framework context class BankDbContext.

i have oracle database 12c version

Since there is not a connection string in web.config on this example, i decided to use entity framework for accessing to oracle database. i downloaded by nuget and installed the oracle.ManagedDataAccess.EntityFramework, oracle.ManagedDataAccess and EntityFramework v6 packages and t alrered the connection string given by thes packages to

<oracle.manageddataaccess.client>
    <version number="*">
      <dataSources>
        <dataSource alias="ORCL" descriptor="(DESCRIPTION =
    (ADDRESS = (PROTOCOL = TCP)(HOST = localhost)(PORT = 1521))
    (CONNECT_DATA =
      (SERVICE_NAME = orcl) 
    )
  )" />
      </dataSources>
    </version>
</oracle.manageddataaccess.client>
<connectionStrings>
    <add name="BankDbContext" providerName="Oracle.ManagedDataAccess.Client" connectionString="User Id=bcdratest;Password=bcdratest;Data Source=ORCL" />
</connectionStrings>

after i have created the Initializer class:

namespace BankAccountsManagementSystem.DataAccessLayer
{
    public class Initializer :DropCreateDatabaseAlways<BankDbContext>
    {
        protected override void Seed(BankDbContext context)
        {


            using(var ctx = new BankDbContext())
            {
               var  banque = new Banque
               {
                   Nom="ENIT Bank",
                   ArgentDepose = 0.0m,
                   Capital =0.0m,
                   NbreClients = 0,
                   NbreComptes=0,
                   NbreCredits=0,
                   SommeCredits = 0
                };

                ctx.Banques.Add(banque);
                ctx.SaveChanges();
              }             
            }


        }
    }

i have started by creating a BanquesController and Banques/Index view when i executed the application, the database is created in first time. after, i created PersonneMoralesController by scaffolding and altered the index Action by the code on this example

but when executing the application i get an exception:

ORA-00604: error occurred at recursive SQL level string 1

ORA-08177: can't serialize access for this transaction
and database is not recreated.

i thought that i have got these errors because of the codes in initializer and banque Controller Index Action, two transactions in same Banques table, so i excluded this Initializer Class File.

but even this, the problem persists when the exectioning of application

why and how to fix this?