SSRS reporting issue after migration

Hell Team,

I had migrated crm from 2013 to 2015 on -premises.Here,I have two server on one i have host CRM application and on another one i have installed SQL.And,now i am trying to fetch report,i got an error.

SQL Reporting Logs will contain this error:

Microsoft.Crm.CrmException: An unexpected error occurred.
System.ServiceModel.Security.SecurityNegotiationException: A call to SSPI failed, see inner exception.
System.Security.Authentication.AuthenticationException: A call to SSPI failed, see inner exception.
System.ComponentModel.Win32Exception: The target principal name is incorrect

Please guide me how i can resolve it.