i have an error when trying to start default.aspx.

```
Compiler Error Message: CS0433: The type 'MySql.Data.MySqlClient.MySqlConnection' exists in both 
'c:\Windows\assembly\GAC_MSIL\MySql.Data\6.3.6.0__c5687fc88969c44d\MySql.Data.dll' and 'c:\Windows\Microsoft.NET\Framework\v2.0.50727\Temporary ASP.NET Files\elwazefa\fd12d8de\3446c68c\assembly`\dl3\dc121b8b\00d6e0c3_62aacb01\MySql.Data.CF.DLL'`

```

*i am using asp.net 3.5*
what is the problem, thanks