There are several things you can try before preparing a showcase:
npm cache clean --force
rm -rf node_modules package-lock.json dist
npm i
npm start
If this fails, you can compare tsconfig*, angular.json with the corresponding files in our resource-histogram demo which is Angular 10. This could give you a clue what option can cause the problem.
If everything else fails, we need a way to reproduce it. I do understand that you cannot give use the whole project but we do need a way to reproduce the problem so that we can fix it. The best would be one of our examples with your additions and/or modifications that had caused the error to appear.
ok, I see that Angular 10 integration uses a different module. I've copied settings from resource-histogram demo, and eventually it started to load. But now CRUD manager doesn't load any data (don't see any errors there). Is there any difference between Pro and Standard scheduler with regards to CRUD?