Log error in new 2026.3.0 ESP Home

ESPHome
1

Today I have update ESP Home to 2026.3.0. and try to install it on all my devices. On two of them I get this message in the log when I try to install :

--------------------------------------------------------------------------------
HARDWARE: ESP32S2 240MHz, 320KB RAM, 4MB Flash
 - contrib-piohome @ 3.4.4 
 - framework-espidf @ 3.50503.0 (5.5.3) 
 - tool-cmake @ 4.0.3 
 - tool-esp-rom-elfs @ 2024.10.11 
 - tool-esptoolpy @ 5.1.2 
 - tool-ninja @ 1.13.1 
 - tool-scons @ 4.40801.0 (4.8.1) 
 - toolchain-xtensa-esp-elf @ 14.2.0+20251107
Reading CMake configuration...
Dependency Graph
|-- lvgl @ 8.4.0
|-- noise-c @ 0.1.11
Compiling .pioenvs/display-dnevna/src/esphome/components/api/api_connection.cpp.o
Compiling .pioenvs/display-dnevna/src/esphome/components/api/api_frame_helper.cpp.o
Compiling .pioenvs/display-dnevna/src/esphome/components/api/api_frame_helper_noise.cpp.o
Compiling .pioenvs/display-dnevna/src/esphome/components/api/api_pb2_service.cpp.o
In file included from src/esphome/core/application.h:46,
                 from src/esphome/components/api/api_frame_helper.h:13,
                 from src/esphome/components/api/api_frame_helper.cpp:1:
src/esphome/components/sensor/sensor.h:42:64: error: expected class-name before ',' token
   42 | class Sensor : public EntityBase, public EntityBase_DeviceClass, public EntityBase_UnitOfMeasurement {
      |                                                                ^
src/esphome/components/sensor/sensor.h:42:102: error: expected class-name before '{' token
   42 | class Sensor : public EntityBase, public EntityBase_DeviceClass, public EntityBase_UnitOfMeasurement {
      |                                                                                                      ^
In file included from src/esphome/core/application.h:46,
                 from src/esphome/components/api/api_frame_helper.h:13,
                 from src/esphome/components/api/api_connection.h:5,
                 from src/esphome/components/api/api_connection.cpp:1:
src/esphome/components/sensor/sensor.h:42:64: error: expected class-name before ',' token
   42 | class Sensor : public EntityBase, public EntityBase_DeviceClass, public EntityBase_UnitOfMeasurement {
      |                                                                ^
src/esphome/components/sensor/sensor.h:42:102: error: expected class-name before '{' token
   42 | class Sensor : public EntityBase, public EntityBase_DeviceClass, public EntityBase_UnitOfMeasurement {
      |                                                                                                      ^
In file included from src/esphome/core/application.h:46,
                 from src/esphome/components/api/api_frame_helper.h:13,
                 from src/esphome/components/api/api_frame_helper_noise.h:2,
                 from src/esphome/components/api/api_frame_helper_noise.cpp:1:
src/esphome/components/sensor/sensor.h:42:64: error: expected class-name before ',' token
   42 | class Sensor : public EntityBase, public EntityBase_DeviceClass, public EntityBase_UnitOfMeasurement {
      |                                                                ^
src/esphome/components/sensor/sensor.h:42:102: error: expected class-name before '{' token
   42 | class Sensor : public EntityBase, public EntityBase_DeviceClass, public EntityBase_UnitOfMeasurement {
      |                                                                                                      ^
Compiling .pioenvs/display-dnevna/src/esphome/components/api/api_server.cpp.o
*** [.pioenvs/display-dnevna/src/esphome/components/api/api_frame_helper.cpp.o] Error 1
*** [.pioenvs/display-dnevna/src/esphome/components/api/api_frame_helper_noise.cpp.o] Error 1
*** [.pioenvs/display-dnevna/src/esphome/components/api/api_connection.cpp.o] Error 1
In file included from src/esphome/core/controller.h:17,
                 from src/esphome/components/api/api_server.h:12,
                 from src/esphome/components/api/api_server.cpp:1:
src/esphome/components/sensor/sensor.h:42:64: error: expected class-name before ',' token
   42 | class Sensor : public EntityBase, public EntityBase_DeviceClass, public EntityBase_UnitOfMeasurement {
      |                                                                ^
src/esphome/components/sensor/sensor.h:42:102: error: expected class-name before '{' token
   42 | class Sensor : public EntityBase, public EntityBase_DeviceClass, public EntityBase_UnitOfMeasurement {
      |                                                                                                      ^
*** [.pioenvs/display-dnevna/src/esphome/components/api/api_server.cpp.o] Error 1
========================= [FAILED] Took 32.19 seconds =========================

I didn´t change anything in YAML, just try to update it. When I try to use “Show API Key” in context menu of device’s it show’s nothing. This is part of my YAML (which work normal since today):

# Enable Home Assistant API
api:
  encryption:
    key: "rJlqbCG6OysxfHjA23vrPaZzRcydGDfDEGGRWYXrrLc="
  actions:
    - action: calibrate_co2_value
      variables:
        co2_ppm: int
      then:
      - scd4x.perform_forced_calibration:
          value: !lambda 'return co2_ppm;'
          id: Co2

ota:
  - platform: esphome
    password: "cf09766f2fd77e8e1ad4d88aa4c6f020"
2

Line 42 there doesn’t look anything like what your log shows

So, it is likely your installation of esphome is corrupt. I would uninstall and try reinstalling it. But, I would look at the file referenced in the log (sensor. h) and see if it matches what is on GitHub.

3

You can also try Clean Build Files.

4

Try that at first, then clean all files but it didn’t help :disappointed: