I get this error when I'm creating in Odoo9 a new database with demodata:

Database creation error: "decoder jpeg not available" while parsing
 /opt/odoo/odoo-server/openerp/addons/base/base_demo.xml:38, near 
<record id="user_demo" model="res.users"> <field name="partner_id" ref="base.partner_demo"/>
 <field name="login">demo</field> <field name="password">demo</field> <field name="signature">-- 
Mr Demo</field> <field name="company_id" ref="main_company"/> 
<field name="groups_id" eval="[(6,0,[ref('base.group_user'), ref('base.group_partner_manager')])]"/>
 <field name="image" type="base64" file="base/static/img/user_demo-image.jpg"/> </record>

How can I fix that? I used the latest nightly build odoo9...