500 Server Error when trying to add applications

[JuRo1971]

ends up in

Installed as addon on Home Assistant OS 13.2 running on a Raspi 4b

Logs:
s6-rc: info: service init-services successfully stopped
s6-rc: info: service init-mods-end: stopping
s6-rc: info: service 00-legacy successfully stopped
s6-rc: info: service init-mods-end successfully stopped
s6-rc: info: service init-mods-package-install: stopping
s6-rc: info: service init-mods-package-install successfully stopped
s6-rc: info: service init-mods: stopping
s6-rc: info: service init-mods successfully stopped
s6-rc: info: service legacy-cont-init: stopping
s6-rc: info: service legacy-cont-init successfully stopped
s6-rc: info: service fix-attrs: stopping
s6-rc: info: service fix-attrs successfully stopped
s6-rc: info: service s6rc-oneshot-runner: stopping
s6-rc: info: service s6rc-oneshot-runner successfully stopped
[custom-init] No custom services found, skipping...
s6-rc: info: service s6rc-oneshot-runner: starting
s6-rc: info: service s6rc-oneshot-runner successfully started
s6-rc: info: service fix-attrs: starting
s6-rc: info: service 00-legacy: starting
s6-rc: info: service 00-legacy successfully started
s6-rc: info: service fix-attrs successfully started
s6-rc: info: service legacy-cont-init: starting
cont-init: info: running /etc/cont-init.d/00-folders
cont-init: info: /etc/cont-init.d/00-folders exited 0
cont-init: info: running /etc/cont-init.d/00-ha-env
cont-init: info: /etc/cont-init.d/00-ha-env exited 0
cont-init: info: running /etc/cont-init.d/01-envfile
cont-init: info: /etc/cont-init.d/01-envfile exited 0
cont-init: info: running /etc/cont-init.d/01-migrations
[migrations] started
[migrations] 01-nginx-site-confs-default: skipped
[migrations] 02-default-location: skipped
[migrations] done
cont-init: info: /etc/cont-init.d/01-migrations exited 0
cont-init: info: running /etc/cont-init.d/10-adduser

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GID/UID

User uid: 1001
User gid: 1001

cont-init: info: /etc/cont-init.d/10-adduser exited 0
cont-init: info: running /etc/cont-init.d/11-folders
cont-init: info: /etc/cont-init.d/11-folders exited 0
cont-init: info: running /etc/cont-init.d/12-samples
cont-init: info: /etc/cont-init.d/12-samples exited 0
cont-init: info: running /etc/cont-init.d/13-nginx
cont-init: info: /etc/cont-init.d/13-nginx exited 0
cont-init: info: running /etc/cont-init.d/14-nossl
No Home Assistant SSL certificates found, changing paths for self-generated certificates
cont-init: info: /etc/cont-init.d/14-nossl exited 0
cont-init: info: running /etc/cont-init.d/14-php
cont-init: info: /etc/cont-init.d/14-php exited 0
cont-init: info: running /etc/cont-init.d/15-keygen
using keys found in /config/heimdall/keys
cont-init: info: /etc/cont-init.d/15-keygen exited 0
cont-init: info: running /etc/cont-init.d/20-permissions
cont-init: info: /etc/cont-init.d/20-permissions exited 0
cont-init: info: running /etc/cont-init.d/50-config
New container detected, installing Heimdall
cont-init: info: /etc/cont-init.d/50-config exited 0
cont-init: info: running /etc/cont-init.d/85-version-checks
cont-init: info: /etc/cont-init.d/85-version-checks exited 0
cont-init: info: running /etc/cont-init.d/99-custom-files
[custom-init] No custom files found, skipping...
cont-init: info: /etc/cont-init.d/99-custom-files exited 0
s6-rc: info: service legacy-cont-init successfully started
s6-rc: info: service init-mods: starting
s6-rc: info: service init-mods successfully started
s6-rc: info: service init-mods-package-install: starting
s6-rc: info: service init-mods-package-install successfully started
s6-rc: info: service init-mods-end: starting
s6-rc: info: service init-mods-end successfully started
s6-rc: info: service init-services: starting
s6-rc: info: service init-services successfully started
s6-rc: info: service legacy-services: starting
services-up: info: copying legacy longrun cron (no readiness notification)
services-up: info: copying legacy longrun nginx (no readiness notification)
services-up: info: copying legacy longrun php-fpm (no readiness notification)
services-up: info: copying legacy longrun queue (no readiness notification)
s6-rc: info: service legacy-services successfully started
s6-rc: info: service 99-ci-service-check: starting
[ls.io-init] done.
s6-rc: info: service 99-ci-service-check successfully started