Could Not Load Type ‘System.ServiceModel.Activation.HttpModule’

Today suddenly i can’t run my website project and show this error

Could Not Load Type ‘System.ServiceModel.Activation.HttpModule’

When attempting to run a service that receives messages over the HTTP transport, you may receive an error similar to the following:

Server Error in ‘/WCFApplication’ Application

Could not load type ‘System.ServiceModel.Activation.HttpModule’ from assembly ‘System.ServiceModel, Version=3.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089’.

Description: An unhandled exception occurred during the execution of the current Web request. Review the stack trace for more information about the error and where it originated in the code.
Exception Details: System.TypeLoadException: Could not load type ‘System.ServiceModel.Activation.HttpModule’ from assembly ‘System.ServiceModel, Version=3.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089’.

and as ussualy i search google and find the solution, i just need to type aspnet_regiis.exe -iru in command prompt at .NET framework 4.0 folder