how to fix ionic application error when we serve the application

When we run this command (ionic lab) then it show this error. how we solve it.. <!-- begin snippet: js hide: false console: true babel: false --> <!-- language: lang-html --> ng run app:serve --host=0.0.0.0 --port=8100 [ng] The run command requires to be run in an Angular project, but a project definition could not be found. [ERROR] ng has unexpectedly closed (exit code 1). The Ionic CLI will exit. Please check any output above for error details. <!-- end snippet -->