Ionic Serve is not working Displaying ng is not recognized

ng run app:serve --host=0.0.0.0 --port=8100
[ng] ‘C:\Users\user\Desktop\app\node_modules.bin\ng’ is not recognized as an internal or external command,
[ng] operable program or batch file.

[ERROR] ng has unexpectedly closed (exit code 1).

    The Ionic CLI will exit. Please check any output above for error details.