Getting 500 error while passing the model to controller from view

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C#3.5

MVC4

Dear Team,

I am getting the following error while call the controller method form the view via http post

"NetworkError: 500 Internal Server Error - http://localhost:50763/Incentive/Incentive_Plan"

i am using form action like this in view

<%using (Ajax.BeginForm("Plan", "Incent", new AjaxOptions { HttpMethod = "POST", OnComplete = "", UpdateTargetId = "plan_tab" }))
  { %>

controls

<%}%>

actionmethod like this

public ActionResult Plan(respective ins, string command)

the problem is, respectiveis my my model name

if i call the method not getting fired,
instead of that

if i am using like this

public ActionResult Plan(> string command)

now getting fired correctly

simple note :
if passing the model then only not getting fired.
help me soon pls

regards,
Velsamy A