ECMA 2.0 for web application

I coded for ECMA 2.0 for web application using WCF  and deployed the management agent dll in Extension folder with WCF config file named as app.config . I am getting the error at creation of Management agent in FIM synchronization at the time of  Refresh Interfaces as The Extension could not be instantiated. May be FIM is unable to read WCF config file from extension folder of FIM sync. Or is there any other thing m missing? . Can any body suggest me.