MySQL version 7.0.6-IR3 issue when try to connect to db

Question

I got below error when i try to connect to MySQL db.

Inheritance security rules violated by type: 'MySql.Data.MySqlClient.MySqlProviderServices'. Derived types must either match the security accessibility of the base type or be less accessible.

Below is the entityframework config:

 <entityFramework codeConfigurationType="MySql.Data.Entity.MySqlEFConfiguration, MySql.Data.Entity.EF6">
    <defaultConnectionFactory type="System.Data.Entity.Infrastructure.SqlConnectionFactory, EntityFramework" />
    <providers>
      <provider invariantName="Oracle.ManagedDataAccess.Client" type="Oracle.ManagedDataAccess.EntityFramework.EFOracleProviderServices, Oracle.ManagedDataAccess.EntityFramework, Version=6.121.2.0, Culture=neutral, PublicKeyToken=89b483f429c47342" />
      <provider invariantName="MySql.Data.MySqlClient" type="MySql.Data.MySqlClient.MySqlProviderServices, MySql.Data.Entity.EF6, Version=7.0.6.0, Culture=neutral, PublicKeyToken=c5687fc88969c44d"></provider>
    </providers>
  </entityFramework>

Before this i'm using MySQL 6.9.9 and no error happen. Please help.

Answer 1

It is a known bug in MySql connector, tracked here: https://bugs.mysql.com/bug.php?id=89134

Workaround is to downgrade to lower version connector (like the one you were using)