One of the reasons this can happen is in you app module, you have an entry components which the build process can’t find a import for (in below example if I comment out the import line and leave the component then it causes this error).
One of the reasons this can happen is in you app module, you have an entry components which the build process can’t find a import for (in below example if I comment out the import line and leave the component then it causes this error).