Fatal error when building: number.h no such file or directory.

[joris-kuleuven]

I try to build a esphome configuration based on github://tobias-93/esphome-ecodan-heatpump@main. However, I cannot build it since I always get the error
src/esphome/components/ecodan/ecodan.h:5:10: fatal error: esphome/components/number/number.h: No such file or directory.
number.h is a file that should be included when esphome builds, so it is strange it is not found. Other dependencies in /components work fine, and when i manually add /number/number.h, it gets removed when I build, resulting in the same error.
The yaml:
.-------------------

esphome:
  name: esphome-web-862c30
  friendly_name: ESPHome_Verwarming

esp32:
  board: esp32dev
  framework:
    type: arduino

external_components:
  - source: github://tobias-93/esphome-ecodan-heatpump@main
    components: [ ecodan ]
logger:
    baud_rate: 0

api:
  encryption:
    key: "xxx"

ota:

wifi:
  ssid: !secret wifi_ssid
  password: !secret wifi_password

  ap:
    ssid: "Esphome-Web-862C30"
    password: "8YpjQovtUVRp"

captive_portal:

web_server:
  port: 80

time:
  - platform: homeassistant
    id: homeassistant_time

uart:
  id: ecodan_uart
  baud_rate: 2400
  tx_pin: GPIO1
  rx_pin: GPIO3
  rx_buffer_size: 1024
  parity: EVEN

ecodan:
  id: ecodan_instance
  uart_id: ecodan_uart

text_sensor:
  - platform: version
    name: ESPHome Version
  - platform: wifi_info
    ip_address:
      name: IP
    ssid:
      name: SSID
    bssid:
      name: BSSID
  - platform: ecodan
    date_time:
      name: Current date/time 

.-------------------

I tried different esphome versions, currently Version: 2024.1.0-dev on MacOS but also the addon on HomeAssistant gives exactly the same errors.
The obvious tricks like reinstalling esphome, clean builds etc do not help.
Where should I look next?

[ssieb]

It's an issue with the external component, not esphome. The component needs to be fixed or you need to define a number of some sort.