:Error: Configuration file is not well-formed XML ERROR] Filename: \\?\C:\Program Files\Microsoft\Exchange Server\V15\FrontEnd\HttpProxy\OAB\web.config

Hi All,

I got an error message saying below while installing step 13 of 15: Client access role: client access front end service while installing Exchange2k13 SP1 on Windows 2k12 server.

Error:
The following error was generated when "$error.Clear(); 
          $InternalOabUrl = "https://" + $RoleFqdnOrName + "/OAB";
          new-OabVirtualDirectory -Role ClientAccess -DomainController $RoleDomainController -InternalUrl $InternalOabUrl;
          get-OabVirtualDirectory -server $RoleFqdnOrName -DomainController $RoleDomainController | set-OabVirtualDirectory -OAuthAuthentication:$true;
        " was run: "Filename: \\?\C:\Program Files\Microsoft\Exchange Server\V15\FrontEnd\HttpProxy\OAB\web.config
Line number: 613
Error: Configuration file is not well-formed XML

".

In the Exchange setup logs i found the below 

Processing object "EXCHANGE2K13\OAB (Default Web Site)".
[12/01/2014 01:20:12.0668] [2] [ERROR] Filename: \\?\C:\Program Files\Microsoft\Exchange Server\V15\FrontEnd\HttpProxy\OAB\web.config
Line number: 613
Error: Configuration file is not well-formed XML


[12/01/2014 01:20:12.0668] [2] [WARNING] An unexpected error has occurred and a Watson dump is being generated: Filename: \\?\C:\Program Files\Microsoft\Exchange Server\V15\FrontEnd\HttpProxy\OAB\web.config
Line number: 613
Error: Configuration file is not well-formed XML

Any suggestions?

Regards

Anusha