Unable to Load persisted workflow with work flow Instance Id

Question

'EnvironmentLocationReference' is not of type 'InternalState'. When loading this instance you must ensure that the activity with name 'EnvironmentLocationReference' implements 'InternalState'.

Please help to resolve this.

Getting Exception in workflowapplication wfapp=new workflowapplication(new workflowDefinition); wfappp.Load(wfId, new TimeSpan(0, 0, 5));

wfid(workflow id) which is saved in persistance database