entity-framework-6 – Entity Framework种子方法异常

我试图在Seed方法中添加一些ApplicationRoles,但是当我执行update-database时,我得到以下异常：

Running Seed method.
System.Runtime.Serialization.SerializationException: Type is not resolved for member ‘Oracle.ManagedDataAccess.Client.OracleException,Oracle.ManagedDataAccess,Version=4.121.2.0,Culture=neutral,PublicKeyToken=89b483f429c47342’.
at System.AppDomain.DoCallBack(CrossAppDomainDelegate callBackDelegate)
at System.Data.Entity.Migrations.Design.ToolingFacade.Run(BaseRunner runner)
at System.Data.Entity.Migrations.Design.ToolingFacade.Update(String targetMigration,Boolean force)
at System.Data.Entity.Migrations.UpdateDatabaseCommand.<>c__DisplayClass2.<.ctor>b__0()
at System.Data.Entity.Migrations.MigrationsDomainCommand.Execute(Action command)
Type is not resolved for member ‘Oracle.ManagedDataAccess.Client.OracleException,PublicKeyToken=89b483f429c47342’.

我在Seed方法中的代码：

var roleStore = new RoleStore<IdentityRole>(context);
var roleManager = new RoleManager<IdentityRole>(roleStore);

if (!context.Roles.Any(r => r.Name == "USER"))
{
    var role = new IdentityRole("USER");
    roleManager.Create(role);
}

update-database正在创建我的表而没有任何问题,它只是Seed方法有问题.

有没有人对这个问题有什么建议？

谢谢.