InvalidObjectStateException in Business Process

Hello All,

Please let me know  why this  below exception comes while running the business process. 

Terrasoft.Common.InvalidObjectStateException: Column Title value cannot be obtained because it has not been loaded.

   at Terrasoft.Core.Entities.EntityColumnValue.get_Value()
   at Terrasoft.Core.Entities.Entity.GetTypedColumnValue[TResult](String valueName)
   at Terrasoft.Core.ProcessEngine.LinkProcessToEntity(Process process, Guid entitySchemaUId, Guid entityId)
   at Terrasoft.Core.Process.ProcessIntermediateCatchSignalEvent.InternalExecute(ProcessExecutingContext context)
   at Terrasoft.Core.Process.ProcessActivity.Execute(ProcessExecutingContext context)

Appreaciate your help..