I have a custom Module that adds functionality to Instant Messaging [im_chat]. And naturally my module depends on [im_chat] being installed.

Eventhough [im_chat] is installed, still I get an error message when I want to install my Module [im_chat_history] that somewhat implies [im_chat] was not installed

2014-10-23 13:20:39,427 1691 CRITICAL odoo-8_test openerp.modules.module: Couldn't load module im_chat_history
2014-10-23 13:20:39,427 1691 CRITICAL odoo-8_test openerp.modules.module: No module named im_chat

I have an __init__.py in my Module that imports the im_chat Module

__init__.py

import im_chat

And it looks to me (having no skills of coding and/or python) odoo fails to do that (importing im_chat).

Does anybody has a hint, what could be wrong here?

============== the code =======================

im.py

from openerp.osv import fields,osv

class im_history(osv.osv):
    _inherit = 'im.message'

im_history()

im_view.xml

<?xml version="1.0" encoding="utf-8"?>
<openerp>
    <data>
      <record id="view_im_history" model="ir.ui.view">
        <field name="name">im.message.tree</field>
        <field name="model">im.message</field>
        <field name="arch" type="xml">
                <tree string="IM">
                    <field name="date"/>
                    <field name="from_id"/>
                    <field name="to_id"/>
                    <field name="message"/>
                </tree>
        </field>
      </record>

      <!-- Top menu item -->
        <menuitem name="IM"
            id="im_history_root"
            groups="base.group_user"
            sequence="10"/>

        <record id="open_view_im_history" model="ir.actions.act_window">
            <field name="name">Instant messaging history</field>
            <field name="res_model">im.message</field>
            <field name="view_type">form</field>
            <field name="view_mode">tree</field>
            <field name="view_id" ref="view_im_history"/>
        </record>

        <menuitem name="Actions" id="im_history" parent="im_history_root" groups="base.group_user"/>
        <menuitem action="open_view_im_history" id="menu_open_view_im_history" parent="im_history" sequence="20" groups="base.group_user"/>

    </data>
</openerp>

__init__.py

import im

__openerp__.py

{
    "name" : "Instant messaging history",
    "version" : "1.1",
    "author" : "L",
    "category" : "Generic Modules/Messaging",
    "website" : "-",
    "description": "Adds history view to instant messaging module.",
    "depends" : ["im_chat"],
    "init_xml" : [],
    "update_xml" : ["im_view.xml"],
    "installable": True
}