"No fixed center_" error with 0.12

[teto]

during the update to 0.12.0 I think, some of my modules-right disappeared (the tray for instance)
The logs give

[2025-03-13 10:49:25.745] [info] Using configuration file /home/teto/.config/waybar/config
[2025-03-13 10:49:25.745] [info] Including resource file: ~/.config/waybar/common.jsonc
[2025-03-13 10:49:25.746] [info] Including resource file: ~/.config/waybar/laptop.jsonc
[2025-03-13 10:49:25.749] [info] Using CSS file /home/teto/.config/waybar/style.css
[2025-03-13 10:49:25.755] [error] No fixed center_

The error message seems to come from #3730
I've just tried #3881 to no avail.
If I remove some of the modules in common.jsonc then I can see my rightmost modules.
My config is big so not sure what to share to help.

Would be nice to have a possible remediation in the error message.

[teto]

Seems like the absence of rightmost modules was a configuration error from myself (include order).
#3881 seems to have make the No fixed center_ message go away.

so now it's strange because it seems to work as intended but I see a
Error: cannot load config file. in

mars 14 23:32:43 hostname waybar[299656]: [2025-03-14 23:32:43.196] [info] Using configuration file /home/teto/.config/waybar/config
mars 14 23:32:43 hostname waybar[299656]: [2025-03-14 23:32:43.196] [info] Including resource file: ~/.config/waybar/common.jsonc
mars 14 23:32:43 hostname waybar[299656]: [2025-03-14 23:32:43.197] [info] Including resource file: ~/.config/waybar/laptop.jsonc
mars 14 23:32:43 hostname waybar[299656]: [2025-03-14 23:32:43.200] [info] Using CSS file /home/teto/.config/waybar/style.css
mars 14 23:32:43 hostname .waybar-wrapped[299656]: invalid (NULL) pointer instance
mars 14 23:32:43 hostname .waybar-wrapped[299656]: g_signal_connect_data: assertion 'G_TYPE_CHECK_INSTANCE (instance)' failed
mars 14 23:32:43 hostname waybar[299797]: Error: cannot load config file.
```.

Closing as waybar seems to work fine despite that message.