How to solve "Could not load file or assembly 'MySql.Web, Version=" when try to open a ASP.NET project?

Detail error message:
Could not load file or assembly 'MySql.Web, Version=6.7.4.0, Culture=neutral, PublicKeyToken=c5687fc88969c44d' or one of its dependencies. The located assembly's manifest definition does not match the assembly reference. (C:\Windows\Microsoft.NET\Framework\v4.0.30319\Config\machine.config line 258)

Solution:
Modify Machine.config in
C:\Windows\Microsoft.NET\Framework\v4.0.30319\Config\machine.config

Comment all of lines related MySql
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