the error appear when I'm trying to create new database on Odoo 10 C

error:

2017-07-10 04:13:56,385 27864 ERROR tes10c odoo.http: 

Traceback (most recent call last):

  File "/opt/odoo/odoo-10.0/odoo/http.py", line 118, in dispatch_rpc

    result = dispatch(method, params)

  File "/opt/odoo/odoo-10.0/odoo/service/common.py", line 57, in dispatch

    return g[exp_method_name](*params)

  File "/opt/odoo/odoo-10.0/odoo/service/common.py", line 29, in exp_authenticate

    res_users = odoo.registry(db)['res.users']

  File "/opt/odoo/odoo-10.0/odoo/__init__.py", line 52, in registry

    return modules.registry.Registry(database_name)

  File "/opt/odoo/odoo-10.0/odoo/modules/registry.py", line 59, in __new__

    return cls.new(db_name)

  File "/opt/odoo/odoo-10.0/odoo/modules/registry.py", line 82, in new

    odoo.modules.load_modules(registry._db, force_demo, status, update_module)

  File "/opt/odoo/odoo-10.0/odoo/modules/loading.py", line 280, in load_modules

    loaded_modules, processed_modules = load_module_graph(cr, graph, status, perform_checks=update_module, report=report)

  File "/opt/odoo/odoo-10.0/odoo/modules/loading.py", line 159, in load_module_graph

    _load_data(cr, module_name, idref, mode, kind='demo')

  File "/opt/odoo/odoo-10.0/odoo/modules/loading.py", line 95, in _load_data

    tools.convert_file(cr, module_name, filename, idref, mode, noupdate, kind, report)

  File "/opt/odoo/odoo-10.0/odoo/tools/convert.py", line 845, in convert_file

    convert_xml_import(cr, module, fp, idref, mode, noupdate, report)

  File "/opt/odoo/odoo-10.0/odoo/tools/convert.py", line 915, in convert_xml_import

    obj.parse(doc.getroot(), mode=mode)

  File "/opt/odoo/odoo-10.0/odoo/tools/convert.py", line 796, in parse

    self.parse(rec, mode)

  File "/opt/odoo/odoo-10.0/odoo/tools/convert.py", line 799, in parse

    self._tags[rec.tag](rec, de, mode=mode)

  File "/opt/odoo/odoo-10.0/odoo/tools/convert.py", line 707, in _tag_record

    id = self.env(context=rec_context)['ir.model.data']._update(rec_model, self.module, res, rec_id or False, not self.isnoupdate(data_node), noupdate=self.isnoupdate(data_node), mode=self.mode)

  File "/opt/odoo/odoo-10.0/odoo/addons/base/ir/ir_model.py", line 1228, in _update

    record = record.create(values)

  File "/opt/odoo/odoo-10.0/odoo/addons/base/res/res_users.py", line 790, in create

    user = super(UsersView, self).create(values)

  File "/opt/odoo/odoo-10.0/odoo/addons/base/res/res_users.py", line 636, in create

    return super(UsersImplied, self).create(values)

  File "/opt/odoo/odoo-10.0/odoo/addons/base/res/res_users.py", line 329, in create

    user = super(Users, self).create(vals)

  File "/opt/odoo/odoo-10.0/odoo/models.py", line 3830, in create

    record = self.browse(self._create(old_vals))

  File "/opt/odoo/odoo-10.0/odoo/models.py", line 3893, in _create

    self.env[parent_model].browse(parent_id).write(parent_vals)

  File "/opt/odoo/odoo-10.0/odoo/addons/base/res/res_partner.py", line 503, in write

    tools.image_resize_images(vals)

  File "/opt/odoo/odoo-10.0/odoo/tools/image.py", line 269, in image_resize_images

    avoid_resize_big=True, avoid_resize_medium=False, avoid_resize_small=False))

  File "/opt/odoo/odoo-10.0/odoo/tools/image.py", line 258, in image_get_resized_images

    return_dict[medium_name] = image_resize_image_medium(base64_source, avoid_if_small=avoid_resize_medium)

  File "/opt/odoo/odoo-10.0/odoo/tools/image.py", line 147, in image_resize_image_medium

    return image_resize_image(base64_source, size, encoding, filetype, avoid_if_small)

  File "/opt/odoo/odoo-10.0/odoo/tools/image.py", line 82, in image_resize_image

    image.save(background_stream, filetype)

  File "/usr/local/lib/python2.7/dist-packages/PIL/Image.py", line 1893, in save

    save_handler(self, fp, filename)

  File "/usr/local/lib/python2.7/dist-packages/PIL/JpegImagePlugin.py", line 604, in _save

    raise IOError("cannot write mode %s as JPEG" % im.mode)

ParseError: "cannot write mode RGBA as JPEG" while parsing /opt/odoo/odoo-10.0/odoo/addons/base/base_demo.xml:40, 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" type="xml"><span>-- <br/>+Mr Demo</span></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 do I resolve it?