Failed to generate code. Could not load file or assembly 'MySql.Data, Version=6.6.5.0 - mysql

Question

I'm getting the following error on all of my website's pages:
Server Error in '/' Application.
Parser Error
Description: An error occurred during the parsing of a resource required to service this request. Please review the following specific parse error details and modify your source file appropriately.
Parser Error Message: Failed to generate code. Could not load file or assembly 'MySql.Data, Version=6.6.5.0, Culture=neutral, PublicKeyToken=c5687fc88969c44d' or one of its dependencies. The located assembly's manifest definition does not match the assembly reference. (Exception from HRESULT: 0x80131040)
Source Error:
Line 1: <?xml version="1.0" encoding="utf-8"?>
Line 2: <xs:schema id="newsarticles" targetNamespace="http://tempuri.org/news.xsd" xmlns:mstns="http://tempuri.org/news.xsd" xmlns="http://tempuri.org/news.xsd" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:msdata="urn:schemas-microsoft-com:xml-msdata" xmlns:msprop="urn:schemas-microsoft-com:xml-msprop" attributeFormDefault="qualified" elementFormDefault="qualified">
Line 3: <xs:annotation>
Source File: /App_Code/news.xsd Line: 1
Assembly Load Trace: The following information can be helpful to determine why the assembly 'MySql.Data, Version=6.6.5.0, Culture=neutral, PublicKeyToken=c5687fc88969c44d' could not be loaded.
I checked the assemblies in my web.config, but no references to MySQL are there:
<compilation debug="true" strict="false" explicit="true" targetFramework="4.0">
<assemblies>
<clear />
<add assembly="System.Design, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B03F5F7F11D50A3A" />
<add assembly="System.Windows.Forms, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" />
<add assembly="System.Web.Extensions, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" />
<add assembly="System.Web.Extensions.Design, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" />
<add assembly="System.Data.Entity, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" />
<add assembly="System.Data.Services, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" />
<add assembly="System.Data.Services.Client, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" /></assemblies>
</compilation>
I then checked the references of my website project. There I noticed a lot of different MySQL versions are referenced. I tried to delete all references but version 6.7.4.0, however, I can't even delete the references (see screenshot).
I have these files in my bin folder, both of version 6.7.4.0:
MySql.Data.dll and MySql.Data.Entity.dll
How to fix this error?

Answer 1

try to add this to your web.config:
<system.data>
<DbProviderFactories>
<remove invariant="MySql.Data.MySqlClient" />
<add name="MySQL Data Provider" invariant="MySql.Data.MySqlClient" description="Data Provider for MySQL" type="MySql.Data.MySqlClient.MySqlClientFactory, MySql.Data" />
</DbProviderFactories>
</system.data>
Also, you don't need to reference any dlls from GAC. Just use nuget packages (MySQL.Data, MySQL.Web)