SSRS - The value of parameter 'param' is not valid. ---> System.UriFormatException: Invalid URI: The Uri string is too long.

I am getting this error when upgraded to SQL Server 2012. Earlier the same report(.rdl) just working fine on SQL Server 2008 R2.

Message = System.Web.Services.Protocols.SoapException: The value of parameter 'param' is not valid. ---> Microsoft.ReportingServices.Diagnostics.Utilities.InvalidParameterException: The value of parameter 'param' is not valid. ---> System.UriFormatException: Invalid URI: The Uri string is too long.

Is there anything changed in SQL Server 2012 regarding this.

Thanks