Unable to write custom code for Telligent APIs

Hi, 

I am trying to calling AddActivity method by using Telligent Dlls “TelligentEvolution.Rest.Client”

TelligentEvolution.Rest.Client.Services.ActivityMessageService objTelligent = new TelligentEvolution.Rest.Client.Services.ActivityMessageService("Site Url", "RestUserName", "RestApiKey", System.Net.CredentialCache.DefaultCredentials);

objTelligent.AddActivity(UserId, "TextMessage","StringType",GroupId)

It is showing an error message "The remote server returned an error: (404) not found"

For other methods of this object it shows same error.

Can someone please help me to troubleshoot this error.

And please specify the location path for xml file like activities.xml,friends.xml etc. which we are using in API to get and post somthing with particular site

Thanks in advance.

Thanks & Regards,

Suvarna