Error during setup of component panel_custom, since HA 0.111.x

[sparkydave1981]

The problem

Error during setup of component panel_custom. Side panel item therefore not loaded. This happens on most restarts however has worked at least once

Environment

Home Assistant 0.111.2

arch	x86_64
chassis	desktop
dev	false
docker	true
docker_version	19.03.8
hassio	true
host_os	Ubuntu 18.04.4 LTS
installation_type	Home Assistant Supervised
os_name	Linux
os_version	5.3.0-59-generic
python_version	3.7.7
supervisor	227
timezone	Australia/Perth
version	0.111.2
virtualenv	false

• Home Assistant Core release with the issue: 0.111.x
• Last working Home Assistant Core release (if known): 0.110.7
• Operating environment (Home Assistant/Supervised/Docker/venv): Ubuntu/HA Supervised general Linux
• Integration causing this issue: panel_custom
• Link to integration documentation on our website: https://www.home-assistant.io/integrations/panel_custom/

Problem-relevant configuration.yaml

N/A

Traceback/Error logs

Log Details (ERROR)
Logger: homeassistant.setup
Source: components/http/init.py:376
First occurred: 7:50:09 (1 occurrences)
Last logged: 7:50:09

Error during setup of component panel_custom
Traceback (most recent call last):
  File "/usr/src/homeassistant/homeassistant/setup.py", line 190, in _async_setup_component
    result = await asyncio.wait_for(task, SLOW_SETUP_MAX_WAIT)
  File "/usr/local/lib/python3.7/asyncio/tasks.py", line 442, in wait_for
    return fut.result()
  File "/usr/src/homeassistant/homeassistant/components/panel_custom/__init__.py", line 180, in async_setup
    hass.http.register_static_path(url, panel_path)
  File "/usr/src/homeassistant/homeassistant/components/http/__init__.py", line 376, in register_static_path
    self.app.router.add_route("GET", url_path, serve_file)
  File "/usr/local/lib/python3.7/site-packages/aiohttp/web_urldispatcher.py", line 1036, in add_route
    expect_handler=expect_handler)
  File "/usr/local/lib/python3.7/site-packages/aiohttp/web_urldispatcher.py", line 308, in add_route
    "registered".format(route=route_obj))
RuntimeError: Added route will never be executed, method GET is already registered

Additional information

[probot-home-assistant]

panel_custom documentation
panel_custom source
_{^{(message by IssueLinks)}}

[sparkydave1981]

This error seems to have stopped since upgrading from 0.111.2 to 0.111.3. I'll report back to close the issue if it stays happy for a few more days.

[sparkydave1981]

Still a problem in 0.111.4

[balloob]

This happens if you register a path that already exists.

[sparkydave1981]

I only have 2 entries for panel_custom.yaml

  - name: alarm
    sidebar_title: Alarm
    sidebar_icon: mdi:shield-home
    config:
      alarmid: alarm_control_panel.house 

  - name: zwavegraph2
    sidebar_title: ZWave Graph2
    sidebar_icon: mdi:access-point-network
    url_path: zwave

which have been working for over a year or more. The 'alarm' side panel is still working but the 'zwave' one does not load

[balloob]

I am only able to reproduce this when I add another config with the same name:

  - name: zwavegraph2
    sidebar_title: ZWave Graph2
    sidebar_icon: mdi:access-point-network
    url_path: zwave

  - name: zwavegraph2

Please check your configuration that you don't include this file twice or something.

[sparkydave1981]

It's certainly not in there twice, the entire yaml file is posted above and it's not anywhere else in my config