Here   I attached entire .py code and .xml file one of button event returns  IndexError: list index out of range  error need a help 

function name is

  def  check_eligibility(

.py file-------------------

from osv import osv,fields
import time
from datetime import datetime
from datetime import timedelta

class hr_employee(osv.osv):

     _name='hr.employee'
     _inherit=['hr.employee','mail.thread']

     _columns={
              'date_of_join' :fields.date('Date of Join',required=True),
              'current_date':fields.date('Applied date',require=True),
              'eligible_details':fields.char('Eligibility Details'),
              'visaexpiry_date':fields.date('Visa Expiry Date'),
               'residence_expiry_date':fields.date('Residence Expiry',required=True),
               'work_permit_date':fields.date('Work Permit'),
               'insurance_expiry_date':fields.date('Insurance date'),
               'license_date':fields.date('License date',required=True)
                             }
     def  check_eligibility(self,cr,uid,ids,context=None):
         day_obj=self.read(cr,uid,ids,['date_of_join','current_date'],context=context)
     print "day_obj#############################",day_obj
         
         calc_vacation=self.pool.get('scheme.type.info').read(cr,uid,ids,['interval','criteria','scheme_id'],context=context)
     print "day_obj#############################",calc_vacation
         
         
         dateformat="%Y-%m-%d"
         d1=datetime.strptime(day_obj[0]['date_of_join'],dateformat)
         d2=datetime.strptime(day_obj[0]['current_date'],dateformat)
         v1=d2-d1
         
         total_days=v1.days
       
         if total_days<=calc_vacation[0]['interval'] and total_days>400:
             msg=calc_vacation[0]['criteria']
         elif total_days<=calc_vacation[0]['interval']:
              msg=calc_vacation[0]['criteria']
         else:
             msg="You are not eligible"
         vals={
               'eligible_details':msg
               }
         self.write(cr,uid,ids,vals)
        
         return True

     def check_residence_expiry_date(self, cr, uid, ids, context=None):
        print "total_days#############################"
         
        expir_var=self.read(cr,uid,ids,['residence_expiry_date','current_date'],context=context)
        dateformat="%Y-%m-%d"
        d1=datetime.strptime(expir_var[0]['residence_expiry_date'],dateformat)
        d2=datetime.strptime(expir_var[0]['current_date'],dateformat)
        v1=d1-d2
        total_days=v1.days
        print "total_days#############################",total_days
        
        if total_days<=20:
            print "total_days#############################",total_days

            ir_model_data = self.pool.get('ir.model.data')
            try:
                compose_form_id = ir_model_data.get_object_reference(cr, uid, 'mail', 'email_compose_message_wizard_form')[1]
            except ValueError:
                compose_form_id = False
    
            return {
                'type': 'ir.actions.act_window',
                'view_type': 'form',
                'view_mode': 'form',
                'res_model': 'mail.compose.message',
                'views': [(compose_form_id, 'form')],
                'view_id': compose_form_id,
                'target': 'new',
                'context': {},
            }
    
     def check_license_expiry(self, cr, uid, ids, context=None):
                print "total_days#############################"
                expir_var=self.read(cr,uid,ids,['license_date','current_date'],context=context)
                dateformat="%Y-%m-%d"
                d1=datetime.strptime(expir_var[0]['license_date'],dateformat)
                d2=datetime.strptime(expir_var[0]['current_date'],dateformat)
                v1=d1-d2
                total_days=v1.days
                print "total_days#############################",total_days
                
                if total_days<=20:
                    print "total_days#############################",total_days
        
                    ir_model_data = self.pool.get('ir.model.data')
                    try:
                        compose_form_id = ir_model_data.get_object_reference(cr, uid, 'mail', 'email_compose_message_wizard_form')[1]
                    except ValueError:
                        compose_form_id = False
            
                    return {
                        'type': 'ir.actions.act_window',
                        'view_type': 'form',
                        'view_mode': 'form',
                        'res_model': 'mail.compose.message',
                        'views': [(compose_form_id, 'form')],
                        'view_id': compose_form_id,
                        'target': 'new',
                        'context': {},
                    }
    
            
    
     
hr_employee()
     
class scheme_type_info(osv.osv):
    
    _name='scheme.type.info'
    
    _columns={
              'scheme_id':fields.integer('Scheme Type',required=True,size=50),
              'interval':fields.integer('interval type ',required=True,size=64),
              'criteria':fields.text('vacation criteria',required=True,size=50),
              'active':fields.boolean('Active')
              }
    
scheme_type_info()
     
     
#      if working>182
#
#  eligible for 2 ticket and 50000
#
# if working<182
#
#     eligible for 1 ticket and 30000
     

   .xml file------------------------

<?xml version="1.0" encoding="utf-8"?>
<openerp>
    <data>
                    
<record  model="ir.ui.view"  id="hr_employee_inherited">
                <field name="name">hr employee inherited</field>
                <field name="model">hr.employee</field>
                <field name="inherit_id"  ref="hr.view_employee_form"/>
               <field name="arch"  type="xml">
               <xpath expr=" /form/sheet/notebook/page/group/group/field[@name='active' ]"  position="after">
               <field name="date_of_join" />
               </xpath>
               
               
             <xpath expr="/form/sheet/notebook/page[@string='HR Settings']" position="after">
                <page string="Allowance Details">
                <group><field name="date_of_join"/></group>
                <group><field name="current_date"/></group>
                <group><field name="eligible_details"/></group>
                <button name="check_eligibility" string="Check Eligibility"
                                type="object" icon="gtk-apply" />
                </page>
               </xpath>
               
               <xpath expr=" /form/sheet/notebook/page[2]/group/group[4]/field[@name='birthday']"  position="after">
                           
        <group> <group><field name="visaexpiry_date" />
               <field name="residence_expiry_date" />
                <field name="work_permit_date" />
                <field name="insurance_expiry_date" />
                 <field name="license_date" /></group>
        </group>
                <group><button name="check_license_expiry" string="License Expiry"
                                type="object" icon="gtk-apply" />
                    <button name="check_residence_expiry_date" string="Residence Expiry"
                                type="object" icon="gtk-apply" /></group>
                       
               </xpath>
               </field>
 </record>
 
 
 <record id="criteria_tree_view_id" model="ir.ui.view">
                <field name="name">scheme.type.info.tree</field>
                <field name="model">scheme.type.info</field>
                <field name="arch" type="xml">
                    <tree string="Vacation Details">                                    
                        <field name="scheme_id"/>
                        <field name="interval"/>
                        <field name="criteria"/>
                        
                    </tree>
                </field>    
    </record>
    
    
    <record id="criteria_form_view_id" model="ir.ui.view">
                <field name="name">scheme.type.info.form</field>
                <field name="model">scheme.type.info</field>
                <field name="arch" type="xml">
                    <form string="Vacation Details">                                    
                        <group><field name="scheme_id"/>
                        <field name="interval"/>
                        <field name="criteria"/>
                        
                        <field name="active"/></group>
                        
                    </form>
                </field>    
    </record>
    
    
    <record id="criteria_action_id" model="ir.actions.act_window">
        <field name="name">Vacation Details</field>
        <field name="res_model">scheme.type.info</field>
        <field name="view_type">form</field>
        <field name="view_mode">tree,form</field>
        
    </record>
    
<menuitem id="menu_vacation_id" name="Vacation Details" parent="hr.menu_hr_main" action="criteria_action_id"/>
 
     
                
    </data>
</openerp>

-------------------------------------------------------

This is the error log

Server Traceback (most recent call last): File "/opt/openerp/server/openerp/addons/web/session.py", line 89, in send return openerp.netsvc.dispatch_rpc(service_name, method, args) File "/opt/openerp/server/openerp/netsvc.py", line 296, in dispatch_rpc result = ExportService.getService(service_name).dispatch(method, params) File "/opt/openerp/server/openerp/service/web_services.py", line 626, in dispatch res = fn(db, uid, *params) File "/opt/openerp/server/openerp/osv/osv.py", line 190, in execute_kw return self.execute(db, uid, obj, method, *args, **kw or {}) File "/opt/openerp/server/openerp/osv/osv.py", line 132, in wrapper return f(self, dbname, *args, **kwargs) File "/opt/openerp/server/openerp/osv/osv.py", line 199, in execute res = self.execute_cr(cr, uid, obj, method, *args, **kw) File "/opt/openerp/server/openerp/osv/osv.py", line 187, in execute_cr return getattr(object, method)(cr, uid, *args, **kw) File "/opt/openerp/server/openerp/addons/mecha_module/mech_info.py", line 39, in check_eligibility msg=calc_vacation[0]['criteria'] IndexError: list index out of range