Angular - Using a component across multiple modules

Remove :

LoadingOverlayModule from AppModule

LoadingOverlayComponent from ProjectsModule

And :

import LoadingOverlayModule Where its required

LoadingOverlayModule is shared module. It has its own component. Now to use its component you need to import LoadingOverlayModule into Project module. Remove LoadingOverlayComponent from project module's declarations.

You will need another component (say ProjectComponent) for Project Module declaration. As shared module is imported into you project module you can directly use overlay component in ProjectComponent template, using selector. Hope this helps.