theme.config seems to be expected in /theme/ not /src/theme/
/frontend/src/addons/kitconcept-volto-light-theme/theme/theme.config doesn't exist
package.json of the project and added the package to 'addons' and installed via mrsdeveloper.
I followed Create a Volto theme add-on – Frontend – Volto add-ons — Plone Documentation v6.0.
It seems that I missed a configuration step. Any hints?