title: _BaseModel__view_look_dom_arch
body: <p>Need to clafiry what is this error.?unable to install my own devbeloped module.?
  rechecked my view XML file also.can't find any error</p>
  
  <pre><code>  File "/home/priyan/Software/openerp-7.0-20130309-002120/openerp/osv/orm.py", line 1776, in __view_look_dom
      xarch, xfields = relation.__view_look_dom_arch(cr, user, f, view_id, ctx)
  AttributeError: 'NoneType' object has no attribute '_BaseModel__view_look_dom_arch'
  2013-03-21 09:19:32,668 3683 ERROR bpl_db openerp.tools.convert: Parse error in /home/priyan/Software/openerp-7.0-20130309-002120/openerp/addons/bpl/bpl_view.xml:276: 
  &lt;record model="ir.ui.view" id="bpl_work_offer_form"&gt;
              &lt;field name="name"&gt;bpl.work.offer.form&lt;/field&gt;
              &lt;field name="model"&gt;bpl.work.offer&lt;/field&gt;
              &lt;field name="arch" type="xml"&gt;
                  &lt;form string="bpl_work_offer" version="7.0"&gt;
                      &lt;sheet&gt;
  
  ..............................................
  
    File "/home/priyan/Software/openerp-7.0-20130309-002120/openerp/osv/osv.py", line 144, in wrapper
      raise except_osv(inst.name, inst.value)
  except_osv: ('ValidateError', u'Error occurred while validating the field(s) arch: Invalid XML for View Architecture!')
  2013-03-21 09:19:32,680 3683 INFO bpl_db werkzeug: 127.0.0.1 - - [21/Mar/2013 09:19:32] "POST /web/dataset/call_button HTTP/1.1" 200 -
  </code></pre>