Your requirements could not be resolved to an installable set of packages.
Problem 1
- contao-community-alliance/dc-general dev-release/2.4.0 requires contao-community-alliance/events-contao-bindings ^5.0@dev -> found contao-community-alliance/events-contao-bindings[dev-release/5.0.0, 5.0.x-dev (alias of dev-release/5.0.0)] but it does not match your minimum-stability.
- contao-community-alliance/dc-general 2.4.x-dev is an alias of contao-community-alliance/dc-general dev-release/2.4.0 and thus requires it to be installed too.
- Root composer.json requires contao-community-alliance/dc-general ^2.4@dev -> satisfiable by contao-community-alliance/dc-general[2.4.x-dev (alias of dev-release/2.4.0)].