I am using a tree view inside a form view
                        

     <field name="search_matches" nolabel="1" widget="many2many_list">
                                 <tree version="7.0" editable="bottom">
                                     <field name="chk_bob" on_change="onchange_owner_id(chk_bob)" widget="selection"/>
                                     <field name="user_id"/>
                                     <field name="stock_type"/>
                                     <field name="structure_building"/>
                                     <field name="property_vaastu"/>
                                      <button name="contact" type="object" string="Play" />
                                 </tree>
                               </field>        
                       it is giving an error message