PrestaShopWebServiceError

Goodday!

After installing the openerp connector succesfully, I try to synchronize the metadata by clicking on " Synchronize Metadata".

But this gives me an error:
 PrestaShopWebServiceError: 'HTTP XML response is not parsable : undefined entity  : line 2, column 1879.

My configuration is:

Version = 1.5
 Location = http://localhost/prestashop/administration/
 Webservice key = P2SXKSDWHCR6RUW31KKUISW7TQT3WQII

The compleet error is:

OpenERP Server Error

Client Traceback (most recent call last):
   File "/opt/openerp/v7/web/addons/web/http.py", line 204, in dispatch
     response["result"] = method(self, **self.params)
   File "/opt/openerp/v7/web/addons/web/controllers/main.py", line 1132, in call_button
     action = self._call_kw(req, model, method, args, {})
   File "/opt/openerp/v7/web/addons/web/controllers/main.py", line 1120, in _call_kw
     return getattr(req.session.model(model), method)(*args, **kwargs)
   File "/opt/openerp/v7/web/addons/web/session.py", line 42, in proxy
     result = self.proxy.execute_kw(self.session._db, self.session._uid, self.session._password, self.model, method, args, kw)
   File "/opt/openerp/v7/web/addons/web/session.py", line 30, in proxy_method
     result = self.session.send(self.service_name, method, *args)
   File "/opt/openerp/v7/web/addons/web/session.py", line 103, in send
     raise xmlrpclib.Fault(openerp.tools.ustr(e), formatted_info)

Server Traceback (most recent call last):
   File "/opt/openerp/v7/web/addons/web/session.py", line 89, in send
     return openerp.netsvc.dispatch_rpc(service_name, method, args)
   File "/opt/openerp/v7/server/openerp/netsvc.py", line 292, in dispatch_rpc
     result = ExportService.getService(service_name).dispatch(method, params)
   File "/opt/openerp/v7/server/openerp/service/web_services.py", line 626, in dispatch
     res = fn(db, uid, *params)
   File "/opt/openerp/v7/server/openerp/osv/osv.py", line 190, in execute_kw
     return self.execute(db, uid, obj, method, *args, **kw or {})
   File "/opt/openerp/v7/server/openerp/osv/osv.py", line 132, in wrapper
     return f(self, dbname, *args, **kwargs)
   File "/opt/openerp/v7/server/openerp/osv/osv.py", line 199, in execute
     res = self.execute_cr(cr, uid, obj, method, *args, **kw)
   File "/opt/openerp/v7/server/openerp/osv/osv.py", line 187, in execute_cr
     return getattr(object, method)(cr, uid, *args, **kw)
   File "/home/wessiez/presta_erp/prestashoperpconnect/prestashoperpconnect/prestashop_model.py", line 109, in synchronize_metadata
     import_batch(session, model, backend_id)
   File "/home/wessiez/presta_erp/prestashoperpconnect/prestashoperpconnect/unit/import_synchronizer.py", line 787, in import_batch
     importer.run(filters=filters, **kwargs)
   File "/home/wessiez/presta_erp/prestashoperpconnect/prestashoperpconnect/unit/import_synchronizer.py", line 182, in run
     record_ids = self._run_page(filters, **kwargs)
   File "/home/wessiez/presta_erp/prestashoperpconnect/prestashoperpconnect/unit/import_synchronizer.py", line 190, in _run_page
     record_ids = self.backend_adapter.search(filters)
   File "/home/wessiez/presta_erp/prestashoperpconnect/prestashoperpconnect/unit/backend_adapter.py", line 126, in search
     return api.search(self._prestashop_model, filters)
   File "/usr/local/lib/python2.7/site-packages/prestapyt/prestapyt.py", line 470, in search
     search(resource, options=options)
   File "/usr/local/lib/python2.7/site-packages/prestapyt/prestapyt.py", line 299, in search
     return self.get(resource, options=options)
   File "/usr/local/lib/python2.7/site-packages/prestapyt/prestapyt.py", line 317, in get
     return self.get_with_url(full_url)
   File "/usr/local/lib/python2.7/site-packages/prestapyt/prestapyt.py", line 489, in get_with_url
     response = super(PrestaShopWebServiceDict, self).get_with_url(url)
   File "/usr/local/lib/python2.7/site-packages/prestapyt/prestapyt.py", line 326, in get_with_url
     return self._parse(self._execute(url, 'GET')[2])
   File "/usr/local/lib/python2.7/site-packages/prestapyt/prestapyt.py", line 197, in _execute
     self._check_status_code(status_code, content)
   File "/usr/local/lib/python2.7/site-packages/prestapyt/prestapyt.py", line 128, in _check_status_code
     raise PrestaShopWebServiceError(error_label % (status_code, message_by_code[status_code], self._parse_error(content)), status_code)
   File "/usr/local/lib/python2.7/site-packages/prestapyt/prestapyt.py", line 153, in _parse_error
     answer = self._parse(xml_content)
   File "/usr/local/lib/python2.7/site-packages/prestapyt/prestapyt.py", line 526, in _parse
     parsed_content = super(PrestaShopWebServiceDict, self)._parse(content)
   File "/usr/local/lib/python2.7/site-packages/prestapyt/prestapyt.py", line 216, in _parse
     raise PrestaShopWebServiceError('HTTP XML response is not parsable : %s. %s' % (e, content[:512]))
 PrestaShopWebServiceError: 'HTTP XML response is not parsable : undefined entity &nbsp;: line 2, column 1879. <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd"> <!--[if lt IE 7]><html class="no-js lt-ie9 lt-ie8 lt-ie7 " lang="nl"> <![endif]--> <!--[if IE 7]><html class="no-js lt-ie9 lt-ie8 ie7" lang="nl"> <![endif]--> <!--[if IE 8]><html class="no-js lt-ie9 ie8" lang="nl"> <![endif]--> <!--[if gt IE 8]><html class="no-js ie9" lang="nl"> <![endif]--><html xmlns="http://www.w3.org/1999/xhtml" xml:lang="nl"><head><title>PrestaShop</title><meta http-equiv="Content-Type" co'