I want to use WCF service in SharePoint 2010 but have problem. 
I did:

First,in mapped Sp2010 folder(ISAPI) I created newfolder/myfile.svc and in that file i putted

<%@ServiceHost
    Language="C#" Factory="Microsoft.SharePoint.Client.Services.MultipleBaseAddressBasicHttpBindingServiceHostFactory,Microsoft.SharePoint.Client.ServerRuntime, Version=14.0.0.0, Culture=neutral, PublicKeyToken=71e9bce111e9429c"
    Service="ACIS.WCFService.GraphProccesor, ACIS.WCFService, Version=1.0.0.0, Culture=neutral, PublicKeyToken=c4ecbdc9be141501"
%>   -->>my dll

2. in additional folder (outside ISAPI) I created WCF service logic (class GraphProccesor, namespace ACIS.WCFService)

I compiled, deployed and everything seems ok. 
in my .dll (c4ecbdc9be141501) - I have namespace and class (same as in above directive), 
in C:\Program Files\Common Files\Microsoft Shared\Web Server Extensions\14\ISAPI\ACISWCFService - I have myfile.svc

But when i try to get url of service in IE i got:

The type 'ACIS.WCFService.GraphProccesor, ACIS.WCFService, Version=1.0.0.0, Culture=neutral, PublicKeyToken=c4ecbdc9be141501', provided as the Service attribute value in the ServiceHost directive could not be found. 

Please, any suggestions? Did I forget something additional?