Getting error: TemplateAssertionError: no filter named 'n' when printing report?

I am trying to print a report for a custom module I am building with Odoo, but when I try to print I get the following error:


  File "/opt/odoo/openerp/service/report.py", line 93, in go
    result, format = openerp.report.render_report(cr, uid, ids, object, datas, context)
  File "/opt/odoo/openerp/report/__init__.py", line 40, in render_report
    return registry['ir.actions.report.xml'].render_report(cr, uid, ids, name, data, context)
  File "/opt/odoo/openerp/api.py", line 241, in wrapper
    return old_api(self, *args, **kwargs)
  File "/opt/odoo/openerp/addons/base/ir/ir_actions.py", line 155, in render_report
    return new_report.create(cr, uid, res_ids, data, context)
  File "/opt/odoo/addons/report_webkit/webkit_report.py", line 376, in create
    result = self.create_source_pdf(cursor, uid, ids, data, report_xml, context)
  File "/opt/odoo/openerp/report/report_sxw.py", line 461, in create_source_pdf
    return self.create_single_pdf(cr, uid, ids, data, report_xml, context)
  File "/opt/odoo/addons/report_webkit/webkit_report.py", line 334, in create_single_pdf
    head_mako_tpl = mako_template(header)
  File "/opt/odoo/addons/report_webkit/webkit_report.py", line 88, in mako_template
    return mako_template_env.from_string(text)
  File "/usr/local/lib/python2.7/dist-packages/http://ift.tt/16mlE8B", line 769, in from_string
    return cls.from_code(self, self.compile(source), globals, None)
  File "/usr/local/lib/python2.7/dist-packages/http://ift.tt/16mlE8B", line 493, in compile
    self.handle_exception(exc_info, source_hint=source)
  File "<unknown>", line 24, in template
TemplateAssertionError: no filter named 'n'

I googled a lot and couldn't find any clue as to how to solve that issue.

I am using webkit reporting. Here is my .mako file.


<html>
<head>
    <style type="text/css">

    </style>
</head>
   <body>
Testing
</body>
</html>

This is how I call the report from the .py file


report_sxw.report_sxw('report.hotel.webkit',
                      'hotel.webkit',
                      'addons/hotel_webkit/report/report_hotel.mako',
                      parser=report_webkit_html)

And finally the XML call


    <report id="sim.report_sim_hotel"
        name="hotel.webkit"
        auto="False"
        model="sim.resumen_wizard" 
        file="hotel_webkit/report/report_hotel.mako" 
        string="Hotel Report Test" 
        webkit_header="base_headers_webkit.base_reports_portrait_header"
        report_type="webkit"/>

Any clue as to what does that error means and what else can I test to make the report work will be appreciated.

Thanks

Getting error: TemplateAssertionError: no filter named 'n' when printing report?

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