Sample.service.ts not found

when i m creating object of sampleservice in the constructor of sample-component its giving error in the run time not giving error in compile time saying dat sample-service no found.

Error: Fetch error: 404 Not Found
Instantiating http://localhost:3000/custom-keyboard.service
Loading http://localhost:3000/dist/demo1.umd.js

Start by reproducing the runtime error while creating Sample.service.ts in the sample-component constructor. Inspect how custom-keyboard.service is resolved and how dist/demo1.umd.js is loaded, then verify that the generated service can be found at runtime without the 404 error.

Written by the indexing model from the issue text.