Hi all,

I have an ODOO15 instance with three databases configured on the instance. Each database is accessed through a separate URL / Domain through Nginx reverse proxy and database name filtering.

Over time, I have installed a couple of OCA extensions without any problems.

Today, when I try to create a new database, the system fails with and error and I am at a loss for the reason. Can someone please assist in shedding some light on possible causes?

The message is as follows:

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The style compilation failed, see the error below. Your recent actions may be the cause, please try reverting the changes you made.

Error: Undefined variable: "$o-mail-thread-avatar-size".
        on line 12573:23 of /stdin

>>             flex: 0 0 $o-mail-thread-avatar-size;

   ----------------------^
This error occurred while compiling the bundle 'web.assets_backend' containing:
    - /web/static/lib/bootstrap/scss/_functions.scss
    - /web/static/lib/bootstrap/scss/_mixins.scss
    - /web/static/src/legacy/scss/bs_mixins_overrides.scss
    - /web/static/src/legacy/scss/utils.scss
    - /web/static/src/legacy/scss/primary_variables.scss
    - /web_editor/static/src/scss/web_editor.variables.scss
    - /web/static/src/legacy/scss/secondary_variables.scss
    - /web_editor/static/src/scss/secondary_variables.scss
    - /web/static/src/legacy/scss/bootstrap_overridden.scss
    - /web/static/src/legacy/scss/bs_mixins_overrides_backend.scss
    - /web_editor/static/src/scss/bootstrap_overridden_backend.scss
    - /web_editor/static/src/scss/bootstrap_overridden.scss
    - /web/static/lib/bootstrap/scss/_variables.scss
    - /web/static/src/legacy/scss/import_bootstrap.scss
    - /web/static/src/legacy/scss/bootstrap_review.scss
    - /web/static/src/core/utils/transitions.scss
    - /web/static/src/core/checkbox/checkbox.scss
    - /web/static/src/core/commands/command_palette.scss
    - /web/static/src/core/debug/debug_menu.scss
    - /web/static/src/core/debug/profiling/profiling_item.scss
    - /web/static/src/core/dialog/dialog.scss
    - /web/static/src/core/dropdown/dropdown.scss
    - /web/static/src/core/effects/rainbow_man.scss
    - /web/static/src/core/hotkeys/hotkey.scss
    - /web/static/src/core/notifications/notification.scss
    - /web/static/src/core/popover/popover.scss
    - /web/static/src/core/position/position.scss
    - /web/static/src/core/tooltip/tooltip.scss
    - /web/static/src/core/ui/block_ui.scss
    - /web/static/src/search/control_panel/control_panel.scss
    - /web/static/src/search/search_panel/search_panel.scss
    - /web/static/src/search/search_panel/search_view.scss
    - /web/static/src/search/search_panel/search_view_extra.scss
    - /web/static/src/views/graph/graph_view.scss
    - /web/static/src/views/pivot/pivot_view.scss
    - /web/static/src/webclient/actions/action_dialog.scss
    - /web/static/src/webclient/loading_indicator/loading_indicator.scss
    - /web/static/src/webclient/navbar/navbar.scss
    - /web/static/src/webclient/user_menu/user_menu.scss
    - /web/static/src/webclient/user_menu/user_menu_items.scss
    - /web/static/src/webclient/webclient.scss
    - /web/static/src/webclient/webclient_extra.scss
    - /web/static/src/webclient/webclient_layout.scss
    - /web/static/src/legacy/scss/domain_selector.scss
    - /web/static/src/legacy/scss/model_field_selector.scss
    - /web/static/src/legacy/scss/progress_bar.scss
    - /web/static/src/legacy/scss/dropdown.scss
    - /web/static/src/legacy/scss/tooltip.scss
    - /web/static/src/legacy/scss/switch_company_menu.scss
    - /web/static/src/legacy/scss/ace.scss
    - /web/static/src/legacy/scss/fields.scss
    - /web/static/src/legacy/scss/file_upload.scss
    - /web/static/src/legacy/scss/views.scss
    - /web/static/src/legacy/scss/form_view.scss
    - /web/static/src/legacy/scss/list_view.scss
    - /web/static/src/legacy/scss/kanban_dashboard.scss
    - /web/static/src/legacy/scss/kanban_examples_dialog.scss
    - /web/static/src/legacy/scss/kanban_column_progressbar.scss
    - /web/static/src/legacy/scss/kanban_view.scss
    - /web/static/src/legacy/scss/web_calendar.scss
    - /web/static/src/legacy/scss/data_export.scss
    - /base/static/src/scss/onboarding.scss
    - /web/static/src/legacy/scss/attachment_preview.scss
    - /web/static/src/legacy/scss/base_document_layout.scss
    - /web/static/src/legacy/scss/special_fields.scss
    - /web/static/src/legacy/scss/ribbon.scss
    - /web/static/src/legacy/scss/base_settings.scss
    - /web/static/src/legacy/scss/report_backend.scss
    - /web/static/src/legacy/scss/dropdown_extra.scss
    - /web/static/src/legacy/scss/fields_extra.scss
    - /web/static/src/legacy/scss/form_view_extra.scss
    - /web/static/src/legacy/scss/list_view_extra.scss
    - /web/static/src/legacy/scss/profiling_qweb_view.scss
    - /auth_totp/static/src/scss/res_users_view_form.scss
    - /base_import/static/src/legacy/scss/base_import.scss
    - /base_import/static/src/legacy/scss/icons.scss
    - /mail_tracking/static/src/css/mail_tracking.scss
    - /mail_tracking/static/src/css/failed_message.scss
    - /web_editor/static/src/scss/web_editor.common.scss
    - /web_editor/static/src/scss/web_editor.backend.scss

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