Errors after starting Theengs Gateway on Home Assistant

I’m trying to install Theengs Gateway last version on

HA is installed on Raspberry Pi3 Model B with 1 GB RAM.

But , when I try to start TG, after few seconds, I receive this errors:

[17:50:37] INFO: Creating TheengsGateway configuration...
[17:50:46] INFO: Starting TheengsGateway...
Traceback (most recent call last):
  File "/usr/lib/python3.9/", line 188, in _run_module_as_main
    mod_name, mod_spec, code = _get_module_details(mod_name, _Error)
  File "/usr/lib/python3.9/", line 147, in _get_module_details
    return _get_module_details(pkg_main_name, error)
  File "/usr/lib/python3.9/", line 111, in _get_module_details
  File "/usr/local/lib/python3.9/dist-packages/TheengsGateway/", line 26, in <module>
    from .ble_gateway import run
  File "/usr/local/lib/python3.9/dist-packages/TheengsGateway/", line 51, in <module>
    from bleak.backends.bluezdbus.advertisement_monitor import OrPattern
  File "/usr/local/lib/python3.9/dist-packages/bleak/backends/bluezdbus/", line 12, in <module>
    from dbus_fast.service import ServiceInterface, dbus_property, method, PropertyAccess
  File "/usr/local/lib/python3.9/dist-packages/dbus_fast/", line 1, in <module>
    from . import introspection, message_bus, proxy_object, service
  File "/usr/local/lib/python3.9/dist-packages/dbus_fast/", line 5, in <module>
    from .errors import InvalidIntrospectionError
  File "/usr/local/lib/python3.9/dist-packages/dbus_fast/", line 57, in <module>
    from .message import Message
  File "src/dbus_fast/", line 1, in init dbus_fast.message
ValueError: dbus_fast.signature.Variant size changed, may indicate binary incompatibility. Expected 48 from C header, got 40 from PyObject

Any idea?
Thanks in advance

This looks like this error:

Hi koenvervloesem.
Thanks for your reply.
I’ve read that TG is certified for Raspberry Pi4 and, indeed, installing it on Pi4 I haven’t this or any other issue.