Hello, 

My report is located in a wizard view (my_module/wizards/stats_view.xml):

<?xml version="1.0" encoding="utf-8"?>
<openerp>
    <data>
        <report
            id="crm_ticket_platforms_report_crm_stats"
            model="stats"
            string="Stats"
            name="crm_ticket_platforms.crm_stats"
            file="crm_ticket_platforms.crm_stats"
            report_type="qweb-pdf"
        />
        ...
        ...

And I have inside of 'reports' folder the next code:

my_module/report/crm_stats.py

from openerp import api, models

class CrmStatsReport(models.AbstractModel):
    _name = 'report.crm_ticket_platforms.crm_stats'

    @api.multi
    def render_html(self, data=None):
        report_obj = self.env['report']
        report = report_obj._get_report_from_name(
            'crm_ticket_platforms.crm_stats')
        docargs = {
            'doc_ids': self._ids,
            'doc_model': report.model,
            'docs': self,
        }
        return report_obj.render('crm_ticket_platforms.crm_stats', docargs)

my_module/report/crm_stats.xml

<?xml version="1.0" encoding="UTF-8"?>
<openerp>
    <data>
        <template id="crm_stats">
            <t t-call="report.html_container">
                <t t-foreach="docs" t-as="o">
                    <t t-call="report.external_layout">
                        <div class="page">
                            <h2>Stats</h2>
                        </div>
                    </t>
                </t>
            </t>
        </template>
    </data>
</openerp>

It doesn't generate errors in my module, but show this errors:

File "/opt/odoo/odoo_8_devel/code/linked-addons/report/models/report.py", line 442, in _run_wkhtmltopdf
    wkhtmltopdf = [_get_wkhtmltopdf_bin()] + command_args + local_command_args
File "/opt/odoo/odoo_8_devel/code/linked-addons/report/models/report.py", line 54, in _get_wkhtmltopdf_bin
    raise IOError
IOError

My version of wkhtmltopdf is 0.12.2.1

I need to fix this, thanks!