Prototype Odoo Cron

crons.xml

<?xml version="1.0" encoding="UTF-8"?>

<openerp>
    <data>
        <record forcecreate="True" id="ir_cron_write_to_tmp" model="ir.cron">
            <field name="name">Alpha Test Cron</field>
            <field eval="True" name="active" />
            <field name="user_id" ref="base.user_root" />
            <field name="interval_number">1</field>
            <field name="interval_type">hours</field>
            <field name="numbercall">-1</field>
            <field eval="False" name="doall" />
            <field eval="'lfah.alpha'" name="model" />
            <field eval="'read_from_tmp'" name="function" />
            <field eval="'()'" name="args" />
        </record>
    </data>
</openerp>

Error:

2015-09-14 20:38:50,515 5282 ERROR demo openerp.addons.base.ir.ir_cron: Call of self.pool.get('lfah.alpha').read_from_tmp(cr, uid, *()) failed in Job 10
Traceback (most recent call last):
File "/usr/lib/python2.7/dist-packages/openerp/addons/base/ir/ir_cron.py", line 121, in _callback
getattr(model, method_name)(cr, uid, *args)
TypeError: read_from_tmp() takes exactly 1 argument (3 given)