HACS fails to load since upgrade

I just upgraded my HA docker system (with docker-compose pull and docker-compose up -d), and now HACS won’t load.

2025-07-02 13:04:41.894 ERROR (MainThread) [homeassistant.config_entries] Error setting up entry  for hacs
Traceback (most recent call last):
  File "/usr/src/homeassistant/homeassistant/config_entries.py", line 749, in __async_setup_with_context
    result = await component.async_setup_entry(hass, self)
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/config/custom_components/hacs/__init__.py", line 246, in async_setup_entry
    setup_result = await async_initialize_integration(hass=hass, config_entry=config_entry)
                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/config/custom_components/hacs/__init__.py", line 214, in async_initialize_integration
    await async_try_startup()
  File "/config/custom_components/hacs/__init__.py", line 201, in async_try_startup
    startup_result = await async_startup()
                     ^^^^^^^^^^^^^^^^^^^^^
  File "/config/custom_components/hacs/__init__.py", line 170, in async_startup
    async_register_frontend(hass, hacs)
    ~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^
  File "/config/custom_components/hacs/frontend.py", line 68, in async_register_frontend
    hass.components.frontend.async_register_built_in_panel(
    ^^^^^^^^^^^^^^^

Also, some of my other integrations won’t load either (e.g. MyEnergi - but I imnagine it needs updating via HACS).

HA version is 2025.6.3

Hello nikkilocke,

What version is the HACS loader? There was a major rev almost a year ago to 2.x.
You will need to read on how to update that, it is a major change.