I’m trying to install SolarSynkv3 to HA which I’m running on Proxmox on a mini PC. When I click install on the app in the App Store I get this error message “An unknown error occurred while trying to build the image for app d4ae3b04_solar_synkv3. Check Supervisor logs for details”. The Supervisor if found below. ChatGPT tells me something about the CPU info is missing but I don’t understand how to solve it. I’m still very new to this an don’t fully grasp how to SSH, run things in Dockers etc yet.
Is my problem easy to solve? Is there more information needed to answer that?
PS. I currently can’t access Proxmox at all via the broswer UI and have forgotten my passwords but that is another poblem, I hope.
From Supervisor
2026-04-17 08:35:22.730 INFO (MainThread) [supervisor.docker.manager] Running command '['docker', 'buildx', 'build', '.', '--tag', 'd4ae3b04/amd64-addon-solar_synkv3:3.0.32', '--file', 'Dockerfile', '--platform', 'linux/amd64', '--pull', '--label', 'io.hass.version=3.0.32', '--label', 'io.hass.arch=amd64', '--label', 'io.hass.type=app', '--label', 'io.hass.name=SolarSynkV3', '--label', 'io.hass.description=Home Assistant add-on for syncing solar/inverter data from SynSynk.net', '--label', 'io.hass.url=https://github.com/martinville/solarsynkv3/tree/main', '--build-arg', 'BUILD_VERSION=3.0.32', '--build-arg', 'BUILD_ARCH=amd64']' on docker.io/library/docker:29.3.1-cli
2026-04-17 08:35:23.473 ERROR (MainThread) [supervisor.docker.addon] Docker build failed for d4ae3b04/amd64-addon-solar_synkv3:3.0.32 (exit code 1). Build output:
#0 building with "default" instance using docker driver
#1 [internal] load build definition from Dockerfile
#1 transferring dockerfile: 409B done
#1 WARN: InvalidDefaultArgInFrom: Default value for ARG $BUILD_FROM results in empty or invalid base image name (line 2)
#1 DONE 0.0s
1 warning found (use docker --debug to expand):
- InvalidDefaultArgInFrom: Default value for ARG $BUILD_FROM results in empty or invalid base image name (line 2)
Dockerfile:2
--------------------
1 | ARG BUILD_FROM
2 | >>> FROM $BUILD_FROM
3 |
4 | # Install requirements for add-on
--------------------
ERROR: failed to build: failed to solve: base name ($BUILD_FROM) should not be blank
2026-04-17 08:35:23.473 ERROR (MainThread) [supervisor.addons.addon] Could not build image for app d4ae3b04_solar_synkv3: Docker build failed for d4ae3b04/amd64-addon-solar_synkv3:3.0.32 (exit code 1). Build output:
#0 building with "default" instance using docker driver
#1 [internal] load build definition from Dockerfile
#1 transferring dockerfile: 409B done
#1 WARN: InvalidDefaultArgInFrom: Default value for ARG $BUILD_FROM results in empty or invalid base image name (line 2)
#1 DONE 0.0s
1 warning found (use docker --debug to expand):
- InvalidDefaultArgInFrom: Default value for ARG $BUILD_FROM results in empty or invalid base image name (line 2)
Dockerfile:2
--------------------
1 | ARG BUILD_FROM
2 | >>> FROM $BUILD_FROM
3 |
4 | # Install requirements for add-on
--------------------
ERROR: failed to build: failed to solve: base name ($BUILD_FROM) should not be blank