Buenos dias,antes de nada darte las gracias, por la respuesta.... despues de hacer esos cambios que me dijiste y comprobar que no me funcionaba, me seguia dando errores, he decidido, empezar de 0 a ver si asi es algo mas facil.
He vuelto a poner el archivo original de la web que esta funcionando, ya que yo ya habia retocado el archivo. Aqui te muestro el primer error que me dio y donde empezo todo, a ver si asi puedo llegar a alguna solucion, gracias de antemano.
Ahora mismo esta asi.
un saludo
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Server Error in '/' Application.
Configuration Error
Description: An error occurred during the processing of a configuration file required to service this request. Please review the specific error details below and modify your configuration file appropriately.
Parser Error Message: Could not load file or assembly 'System.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35' or one of its dependencies. The system cannot find the file specified.
Source Error:
Line 28: <compilation debug="true">
Line 29: <assemblies>
Line 30: <add assembly="System.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"/>
Line 31: <add assembly="PresentationCore, Version=3.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/>
Line 32: <add assembly="PresentationFramework, Version=3.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/>
Source File: E:\kunden\homepages\42\d323739943\web.config Line: 30
Assembly Load Trace: The following information can be helpful to determine why the assembly 'System.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35' could not be loaded.
WRN: Assembly binding logging is turned OFF.
To enable assembly bind failure logging, set the registry value [HKLM\Software\Microsoft\Fusion!EnableLog] (DWORD) to 1.
Note: There is some performance penalty associated with assembly bind failure logging.
To turn this feature off, remove the registry value [HKLM\Software\Microsoft\Fusion!EnableLog].