SharePoint 2010 Business connectivity service launch issue

Hello,

Where i try to launch SharePoint 2010 business connectivity service from IIS, i encountered following error


The farm is unavailable. 
  Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. 

 Exception Details: System.InvalidOperationException: The farm is unavailable.

Source Error: 
 An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.  

Stack Trace:

[InvalidOperationException: The farm is unavailable.]
   Microsoft.SharePoint.Administration.Claims.SPSecurityTokenServiceManager.get_Local() +298
   Microsoft.SharePoint.IdentityModel.SPServiceIssuerNameRegistry..ctor() +11
   Microsoft.SharePoint.SPServiceHostOperations.Configure(ServiceHostBase serviceHost, SPServiceAuthenticationMode authenticationMode) +100
   Microsoft.SharePoint.Administration.SPIisWebServiceApplication.ConfigureServiceHost(ServiceHostBase serviceHost, SPServiceAuthenticationMode authenticationMode) +13
   Microsoft.SharePoint.BusinessData.SharedService.BdcServiceHostFactory.CreateServiceHost(String constructorString, Uri[] baseAddresses) +47
   System.ServiceModel.HostingManager.CreateService(String normalizedVirtualPath) +693
   System.ServiceModel.HostingManager.ActivateService(String normalizedVirtualPath) +42
   System.ServiceModel.HostingManager.EnsureServiceAvailable(String normalizedVirtualPath) +479

[ServiceActivationException: The service '/931bc612b953483e87c7573ac4f5c68d/bdcservice.svc' cannot be activated due to an exception during compilation.  The exception message is: The farm is unavailable..]
   System.ServiceModel.AsyncResult.End(IAsyncResult result) +11653822
   System.ServiceModel.Activation.HostedHttpRequestAsyncResult.End(IAsyncResult result) +194
   System.ServiceModel.Activation.ServiceHttpModule.EndProcessRequest(IAsyncResult ar) +42
   System.Web.AsyncEventExecutionStep.OnAsyncEventCompletion(IAsyncResult ar) +8770259


I am working on this error since a week. Any help will be appreciated.

Regards,