Hi,
I've trigger this exception after a successfull paypal transaction made with sandbox accounts :
```
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500: Internal Server Error
Error
Error message:
Traceback
Traceback (most recent call last):
File "/usr/lib/python2.7/dist-packages/openerp/addons/website/models/ir_http.py", line 198, in _handle_exception
response = super(ir_http, self)._handle_exception(exception)
File "/usr/lib/python2.7/dist-packages/openerp/addons/base/ir/ir_http.py", line 105, in _handle_exception
return request._handle_exception(exception)
File "/usr/lib/python2.7/dist-packages/openerp/http.py", line 561, in _handle_exception
return super(HttpRequest, self)._handle_exception(exception)
File "/usr/lib/python2.7/dist-packages/openerp/addons/base/ir/ir_http.py", line 132, in _dispatch
result = request.dispatch()
File "/usr/lib/python2.7/dist-packages/openerp/http.py", line 573, in dispatch
r = self._call_function(**self.params)
File "/usr/lib/python2.7/dist-packages/openerp/http.py", line 314, in _call_function
return checked_call(self.db, *args, **kwargs)
File "/usr/lib/python2.7/dist-packages/openerp/service/model.py", line 113, in wrapper
return f(dbname, *args, **kwargs)
File "/usr/lib/python2.7/dist-packages/openerp/http.py", line 311, in checked_call
return self.endpoint(*a, **kw)
File "/usr/lib/python2.7/dist-packages/openerp/http.py", line 688, in __call__
return self.method(*args, **kw)
File "/usr/lib/python2.7/dist-packages/openerp/http.py", line 363, in response_wrap
response = f(*args, **kw)
File "/usr/lib/python2.7/dist-packages/openerp/addons/website_sale/controllers/main.py", line 775, in payment_validate
composer_id = request.registry['mail.compose.message'].create(cr, SUPERUSER_ID, composer_values, context=email_ctx)
File "/usr/lib/python2.7/dist-packages/openerp/api.py", line 234, in wrapper
return old_api(self, *args, **kwargs)
File "/usr/lib/python2.7/dist-packages/openerp/addons/mail/mail_message.py", line 804, in create
newid = super(mail_message, self).create(cr, uid, values, context)
File "/usr/lib/python2.7/dist-packages/openerp/api.py", line 234, in wrapper
return old_api(self, *args, **kwargs)
File "/usr/lib/python2.7/dist-packages/openerp/api.py", line 329, in old_api
result = method(recs, *args, **kwargs)
File "/usr/lib/python2.7/dist-packages/openerp/models.py", line 3917, in create
vals = self._add_missing_default_values(vals)
File "/usr/lib/python2.7/dist-packages/openerp/api.py", line 232, in wrapper
return new_api(self, *args, **kwargs)
File "/usr/lib/python2.7/dist-packages/openerp/api.py", line 461, in new_api
result = method(self._model, cr, uid, *args, **kwargs)
File "/usr/lib/python2.7/dist-packages/openerp/models.py", line 1827, in _add_missing_default_values
defaults = self.default_get(cr, uid, list(missing_defaults), context)
File "/usr/lib/python2.7/dist-packages/openerp/api.py", line 234, in wrapper
return old_api(self, *args, **kwargs)
File "/usr/lib/python2.7/dist-packages/openerp/addons/email_template/wizard/mail_compose_message.py", line 54, in default_get
res.get('model'), res.get('res_id'), context=context
File "/usr/lib/python2.7/dist-packages/openerp/api.py", line 234, in wrapper
return old_api(self, *args, **kwargs)
File "/usr/lib/python2.7/dist-packages/openerp/addons/email_template/wizard/mail_compose_message.py", line 103, in onchange_template_id
values = self.generate_email_for_composer_batch(cr, uid, template_id, [res_id], context=context)[res_id]
File "/usr/lib/python2.7/dist-packages/openerp/api.py", line 234, in wrapper
return old_api(self, *args, **kwargs)
File "/usr/lib/python2.7/dist-packages/openerp/addons/email_template/wizard/mail_compose_message.py", line 167, in generate_email_for_composer_batch
template_values = self.pool.get('email.template').generate_email_batch(cr, uid, template_id, res_ids, fields=fields, context=ctx)
File "/usr/lib/python2.7/dist-packages/openerp/api.py", line 234, in wrapper
return old_api(self, *args, **kwargs)
File "/usr/lib/python2.7/dist-packages/openerp/addons/email_template/email_template.py", line 514, in generate_email_batch
result, format = self.pool['report'].get_pdf(cr, uid, [res_id], report_service, context=ctx), 'pdf'
File "/usr/lib/python2.7/dist-packages/openerp/api.py", line 234, in wrapper
return old_api(self, *args, **kwargs)
File "/usr/lib/python2.7/dist-packages/openerp/addons/report/models/report.py", line 253, in get_pdf
paperformat, specific_paperformat_args, save_in_attachment
File "/usr/lib/python2.7/dist-packages/openerp/api.py", line 234, in wrapper
return old_api(self, *args, **kwargs)
File "/usr/lib/python2.7/dist-packages/openerp/addons/report/models/report.py", line 417, in _run_wkhtmltopdf
process = subprocess.Popen(wkhtmltopdf, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
File "/usr/lib/python2.7/subprocess.py", line 679, in __init__
errread, errwrite)
File "/usr/lib/python2.7/subprocess.py", line 1259, in _execute_child
raise child_exception
OSError: [Errno 2] No such file or directory
```
What that this error means ?
