500: Internal Server Error

Traceback

Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/odoo/http.py", line 1377, in get_response
    result.flatten()
  File "/usr/lib/python3/dist-packages/odoo/http.py", line 1242, in flatten
    self.response.append(self.render())
  File "/usr/lib/python3/dist-packages/odoo/http.py", line 1235, in render
    return env["ir.ui.view"]._render_template(self.template, self.qcontext)
  File "/usr/lib/python3/dist-packages/odoo/addons/base/models/ir_ui_view.py", line 1709, in _render_template
    return self.browse(self.get_view_id(template))._render(values, engine)
  File "/usr/lib/python3/dist-packages/odoo/addons/website/models/ir_ui_view.py", line 411, in _render
    return super(View, self)._render(values, engine=engine, minimal_qcontext=minimal_qcontext)
  File "/usr/lib/python3/dist-packages/odoo/addons/web_editor/models/ir_ui_view.py", line 28, in _render
    return super(IrUiView, self)._render(values=values, engine=engine, minimal_qcontext=minimal_qcontext)
  File "/usr/lib/python3/dist-packages/odoo/addons/base/models/ir_ui_view.py", line 1717, in _render
    return self.env[engine]._render(self.id, qcontext)
  File "/usr/lib/python3/dist-packages/odoo/addons/base/models/ir_qweb.py", line 55, in _render
    result = super(IrQWeb, self)._render(id_or_xml_id, values=values, **context)
  File "/usr/lib/python3/dist-packages/odoo/addons/base/models/qweb.py", line 258, in _render
    self.compile(template, options)(self, body.append, values or {})
  File "/usr/lib/python3/dist-packages/odoo/addons/base/models/qweb.py", line 333, in _compiled_fn
    raise e
  File "/usr/lib/python3/dist-packages/odoo/addons/base/models/qweb.py", line 331, in _compiled_fn
    return compiled(self, append, new, options, log)
  File "<template>", line 1, in template_eppela_theme_p_not_found_5168
  File "/usr/lib/python3/dist-packages/odoo/addons/base/models/qweb.py", line 333, in _compiled_fn
    raise e
  File "/usr/lib/python3/dist-packages/odoo/addons/base/models/qweb.py", line 331, in _compiled_fn
    return compiled(self, append, new, options, log)
  File "<template>", line 1, in template_web_frontend_layout_5220
  File "<decorator-gen-67>", line 2, in _get_asset_nodes
  File "/usr/lib/python3/dist-packages/odoo/tools/cache.py", line 90, in lookup
    value = d[key] = self.method(*args, **kwargs)
  File "/usr/lib/python3/dist-packages/odoo/addons/base/models/ir_qweb.py", line 297, in _get_asset_nodes
    return remains + asset.to_node(css=css, js=js, debug=debug, async_load=async_load, defer_load=defer_load, lazy_load=lazy_load)
  File "/usr/lib/python3/dist-packages/odoo/addons/base/models/assetsbundle.py", line 153, in to_node
    css_attachments = self.css() or []
  File "/usr/lib/python3/dist-packages/odoo/addons/base/models/assetsbundle.py", line 346, in css
    self.save_attachment("css", css)
  File "/usr/lib/python3/dist-packages/odoo/addons/base/models/assetsbundle.py", line 313, in save_attachment
    self.clean_attachments(type)
  File "/usr/lib/python3/dist-packages/odoo/addons/base/models/assetsbundle.py", line 243, in clean_attachments
    attachments.unlink()
  File "/usr/lib/python3/dist-packages/odoo/addons/base/models/ir_attachment.py", line 534, in unlink
    res = super(IrAttachment, self).unlink()
  File "/usr/lib/python3/dist-packages/odoo/models.py", line 3452, in unlink
    cr.execute(query, (sub_ids,))
  File "<decorator-gen-3>", line 2, in execute
  File "/usr/lib/python3/dist-packages/odoo/sql_db.py", line 101, in check
    return f(self, *args, **kwargs)
  File "/usr/lib/python3/dist-packages/odoo/sql_db.py", line 298, in execute
    res = self._obj.execute(query, params)
Exception

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/odoo/http.py", line 1377, in get_response
    result.flatten()
  File "/usr/lib/python3/dist-packages/odoo/http.py", line 1242, in flatten
    self.response.append(self.render())
  File "/usr/lib/python3/dist-packages/odoo/http.py", line 1235, in render
    return env["ir.ui.view"]._render_template(self.template, self.qcontext)
  File "/usr/lib/python3/dist-packages/odoo/addons/base/models/ir_ui_view.py", line 1709, in _render_template
    return self.browse(self.get_view_id(template))._render(values, engine)
  File "/usr/lib/python3/dist-packages/odoo/addons/website/models/ir_ui_view.py", line 411, in _render
    return super(View, self)._render(values, engine=engine, minimal_qcontext=minimal_qcontext)
  File "/usr/lib/python3/dist-packages/odoo/addons/web_editor/models/ir_ui_view.py", line 28, in _render
    return super(IrUiView, self)._render(values=values, engine=engine, minimal_qcontext=minimal_qcontext)
  File "/usr/lib/python3/dist-packages/odoo/addons/base/models/ir_ui_view.py", line 1717, in _render
    return self.env[engine]._render(self.id, qcontext)
  File "/usr/lib/python3/dist-packages/odoo/addons/base/models/ir_qweb.py", line 55, in _render
    result = super(IrQWeb, self)._render(id_or_xml_id, values=values, **context)
  File "/usr/lib/python3/dist-packages/odoo/addons/base/models/qweb.py", line 258, in _render
    self.compile(template, options)(self, body.append, values or {})
  File "/usr/lib/python3/dist-packages/odoo/addons/base/models/qweb.py", line 333, in _compiled_fn
    raise e
  File "/usr/lib/python3/dist-packages/odoo/addons/base/models/qweb.py", line 331, in _compiled_fn
    return compiled(self, append, new, options, log)
  File "<template>", line 1, in template_eppela_theme_p_not_found_5168
  File "/usr/lib/python3/dist-packages/odoo/addons/base/models/qweb.py", line 333, in _compiled_fn
    raise e
  File "/usr/lib/python3/dist-packages/odoo/addons/base/models/qweb.py", line 331, in _compiled_fn
    return compiled(self, append, new, options, log)
  File "<template>", line 1, in template_web_frontend_layout_5220
  File "<decorator-gen-67>", line 2, in _get_asset_nodes
  File "/usr/lib/python3/dist-packages/odoo/tools/cache.py", line 90, in lookup
    value = d[key] = self.method(*args, **kwargs)
  File "/usr/lib/python3/dist-packages/odoo/addons/base/models/ir_qweb.py", line 297, in _get_asset_nodes
    return remains + asset.to_node(css=css, js=js, debug=debug, async_load=async_load, defer_load=defer_load, lazy_load=lazy_load)
  File "/usr/lib/python3/dist-packages/odoo/addons/base/models/assetsbundle.py", line 153, in to_node
    css_attachments = self.css() or []
  File "/usr/lib/python3/dist-packages/odoo/addons/base/models/assetsbundle.py", line 346, in css
    self.save_attachment("css", css)
  File "/usr/lib/python3/dist-packages/odoo/addons/base/models/assetsbundle.py", line 313, in save_attachment
    self.clean_attachments(type)
  File "/usr/lib/python3/dist-packages/odoo/addons/base/models/assetsbundle.py", line 243, in clean_attachments
    attachments.unlink()
  File "/usr/lib/python3/dist-packages/odoo/addons/base/models/ir_attachment.py", line 534, in unlink
    res = super(IrAttachment, self).unlink()
  File "/usr/lib/python3/dist-packages/odoo/models.py", line 3452, in unlink
    cr.execute(query, (sub_ids,))
  File "<decorator-gen-3>", line 2, in execute
  File "/usr/lib/python3/dist-packages/odoo/sql_db.py", line 101, in check
    return f(self, *args, **kwargs)
  File "/usr/lib/python3/dist-packages/odoo/sql_db.py", line 298, in execute
    res = self._obj.execute(query, params)
psycopg2.extensions.TransactionRollbackError: could not serialize access due to concurrent update