how to pass values form object to list

Question

what mistake i had done here any one find pls. 

its shows error as cannot serialize non finite numbers .what is meaning pls find any one 

 is_connstring="get";

function fn_save()

{

try

{

debugger;

if (fn_validate() == false)

return;

var ls_object = new Object();

var details_arr = new Array();

ls_object.mcode = document.getElementById("ti_mcode").value;

ls_object.mpartno = document.getElementById("ti_mpartno").value;

ls_object.mname = document.getElementById("ti_mname");

ls_object.mclasscode = document.getElementById("ti_mclasscode").value;

ls_object.cmpcode = document.getElementById("ti_cmpcode").value;

ls_object.plant = document.getElementById("ti_plant").value;

ls_object.barea = document.getElementById("ti_barea").value;

details_arr.push(ls_object);

here  shows error as cannot serialize non finite numbers

Example.WebService.Update_Machine_details(is_connstring, details_arr, Update_result, fault);

}

catch (e)

{

alert(e);

}

}