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What are the steps to reproduce your issue?

We are currently working with the following platforms’ versions in the development environment: 

Python 3.8.5

Ubuntu 20.04 LTS

Odoo v: 12.0:54b40f1eb09


Startup Odoo. 

What is currently happening?

Trying to start-up, we are getting the error described below, and the server doesn’t run. 

What are you expecting to happen?

We expect that the server runs without any error. 

Note:  For a faster turnaround, please share as much detail as you can.  Tell us which Menu sequences you follow. Attach screenshots. Share a video.


“2020-10-08 19:49:24,311 39299 ERROR odoo werkzeug: Error on request:

Traceback (most recent call last):

  File "/opt/odoo/env/lib/python3.8/site-packages/werkzeug/serving.py", line 205, in run_wsgi

    execute(self.server.app)

  File "/opt/odoo/env/lib/python3.8/site-packages/werkzeug/serving.py", line 193, in execute

    application_iter = app(environ, start_response)

  File "/mnt/home/rvivas/Workspace/dev/github.com/odoo/odoo/odoo/service/server.py", line 434, in app

    return self.app(e, s)

  File "/mnt/home/rvivas/Workspace/dev/github.com/odoo/odoo/odoo/service/wsgi_server.py", line 142, in application

    return application_unproxied(environ, start_response)

  File "/mnt/home/rvivas/Workspace/dev/github.com/odoo/odoo/odoo/service/wsgi_server.py", line 117, in application_unproxied

    result = odoo.http.root(environ, start_response)

  File "/mnt/home/rvivas/Workspace/dev/github.com/odoo/odoo/odoo/http.py", line 1320, in call

    return self.dispatch(environ, start_response)

  File "/mnt/home/rvivas/Workspace/dev/github.com/odoo/odoo/odoo/http.py", line 1293, in call

    return self.app(environ, start_wrapped)

  File "/opt/odoo/env/lib/python3.8/site-packages/werkzeug/wsgi.py", line 599, in call

    return self.app(environ, start_response)

  File "/mnt/home/rvivas/Workspace/dev/github.com/odoo/odoo/odoo/http.py", line 1488, in dispatch

    result = ir_http.dispatch()

  File "/mnt/home/rvivas/Workspace/dev/github.com/odoo/odoo/addons/web_editor/models/ir_http.py", line 22, in dispatch

    return super(IrHttp, cls)._dispatch()

  File "/mnt/home/rvivas/Workspace/dev/github.com/odoo/odoo/odoo/addons/base/models/ir_http.py", line 212, in _dispatch

    return cls._handle_exception(e)

  File "/mnt/home/rvivas/Workspace/dev/github.com/odoo/odoo/odoo/addons/base/models/ir_http.py", line 182, in _handle_exception

    return request._handle_exception(exception)

  File "/mnt/home/rvivas/Workspace/dev/github.com/odoo/odoo/odoo/http.py", line 776, in _handle_exception

    return super(HttpRequest, self)._handle_exception(exception)

  File "/mnt/home/rvivas/Workspace/dev/github.com/odoo/odoo/odoo/http.py", line 314, in _handle_exception

    raise pycompat.reraise(type(exception), exception, sys.exc_info()[2])

  File "/mnt/home/rvivas/Workspace/dev/github.com/odoo/odoo/odoo/tools/pycompat.py", line 87, in reraise

    raise value

  File "/mnt/home/rvivas/Workspace/dev/github.com/odoo/odoo/odoo/addons/base/models/ir_http.py", line 208, in _dispatch

    result = request.dispatch()

  File "/mnt/home/rvivas/Workspace/dev/github.com/odoo/odoo/odoo/http.py", line 835, in dispatch

    r = self._call_function(self.params)

  File "/mnt/home/rvivas/Workspace/dev/github.com/odoo/odoo/odoo/http.py", line 346, in _call_function

    return checked_call(self.db, *args, kwargs)

  File "/mnt/home/rvivas/Workspace/dev/github.com/odoo/odoo/odoo/service/model.py", line 98, in wrapper

    return f(dbname, args, kwargs)

  File "/mnt/home/rvivas/Workspace/dev/github.com/odoo/odoo/odoo/http.py", line 342, in checked_call

    result.flatten()

  File "/mnt/home/rvivas/Workspace/dev/github.com/odoo/odoo/odoo/http.py", line 1270, in flatten

    self.response.append(self.render())

  File "/mnt/home/rvivas/Workspace/dev/github.com/odoo/odoo/odoo/http.py", line 1263, in render

    return env["ir.ui.view"].render_template(self.template, self.qcontext)

  File "/mnt/home/rvivas/Workspace/dev/github.com/odoo/odoo/odoo/addons/base/models/ir_ui_view.py", line 1324, in render_template

    return self.browse(self.get_view_id(template)).render(values, engine)

  File "/mnt/home/rvivas/Workspace/dev/github.com/odoo/odoo/addons/web_editor/models/ir_ui_view.py", line 29, in render

    return super(IrUiView, self).render(values=values, engine=engine, minimal_qcontext=minimal_qcontext)

  File "/mnt/home/rvivas/Workspace/dev/github.com/odoo/odoo/odoo/addons/base/models/ir_ui_view.py", line 1333, in render

    return self.env[engine].render(self.id, qcontext)

  File "/mnt/home/rvivas/Workspace/dev/github.com/odoo/odoo/odoo/addons/base/models/ir_qweb.py", line 59, in render

    result = super(IrQWeb, self).render(id_or_xml_id, values=values, context)

  File "/mnt/home/rvivas/Workspace/dev/github.com/odoo/odoo/odoo/addons/base/models/qweb.py", line 275, in render

    self.compile(template, options)(self, body.append, values or {})

  File "<decorator-gen-54>", line 2, in compile

 File "/mnt/home/rvivas/Workspace/dev/github.com/odoo/odoo/odoo/tools/cache.py", line 93, in lookup

    value = d[key] = self.method(args, kwargs)

  File "/mnt/home/rvivas/Workspace/dev/github.com/odoo/odoo/odoo/addons/base/models/ir_qweb.py", line 114, in compile

    return super(IrQWeb, self).compile(id_or_xml_id, options=options)

  File "/mnt/home/rvivas/Workspace/dev/github.com/odoo/odoo/odoo/addons/base/models/qweb.py", line 338, in compile

    raise QWebException("Error when compiling AST", e, path, node and etree.tostring(node[0], encoding='unicode'), name)

odoo.addons.base.models.qweb.QWebException: Name node can't be used with 'None' constant

Traceback (most recent call last):

  File "/mnt/home/rvivas/Workspace/dev/github.com/odoo/odoo/odoo/tools/cache.py", line 88, in lookup

    r = d[key]

  File "/mnt/home/rvivas/Workspace/dev/github.com/odoo/odoo/odoo/tools/func.py", line 69, in wrapper

    return func(self, *args, kwargs)

  File "/mnt/home/rvivas/Workspace/dev/github.com/odoo/odoo/odoo/tools/lru.py", line 44, in __getitem

    a = self.d[obj].me

KeyError: ('ir.qweb', <function IrQWeb.compile at 0x7f8e152869d0>, 173, ('es_MX', None, None, None, None, None))

During handling of the above exception, another exception occurred:

Traceback (most recent call last):

  File "/mnt/home/rvivas/Workspace/dev/github.com/odoo/odoo/odoo/addons/base/models/qweb.py", line 330, in compile

    unsafe_eval(compile(astmod, '<template>', 'exec'), ns)

ValueError: Name node can't be used with 'None' constant

Error when compiling AST

ValueError: Name node can't be used with 'None' constant

Template: 173

Path: /templates/t/t/form/input[2]

Node: <input type="hidden" name="redirect" t-att-value="redirect"/> - - -”


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Best Answer

Odoo 12.0 does not support Python 3.8. Please install Python 3.6.

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Yes, v12 does not work with py3.8

Author Best Answer

ok, thank you very much for your answers

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