Metadata contains a reference that cannot be resolved? CRM 2011

hi i am using CRM sdk to communicate with CRM 2011
recently there is change in URL previously the url was"http://servername/XrmServices/2011/Organization.svc" and the code was working fine but now the url changes to "https://servername/XrmServices/2011/Organization.svc" & it is throwing an error like "Metadata contains a reference that cannot be resolved"

Thanks in Advance Please help