Angular No module factory available for dependency type: ContextElementDependency

Steps I took to fix this problem in case if someone encounters it:

1. Package.json: remove webpack from DevDependencies
2. rm -R node_modules (remove node_modules folder)
3. npm i -g webpack
4. npm i -g webpack-dev-server
5. remove package-lock.json (if it's there)
6. npm i
7. npm start

I still don't completely understand the reasons why this happened.

Do npm ls webpack

If you see two versions of webpack (under @angular/cli and the root node_modules), Then that is the problem. Delete/Rename the webpack under @angular/cli and in the .bin folder of @angular/cli.

Problem solved for me