Npm babel-node not starting what can i do?

when i enter “npm start” the terminal shows this result

nodemon --exec babel-node src/server.js

[nodemon] 2.0.4
[nodemon] to restart at any time, enter rs
[nodemon] watching path(s): .
[nodemon] watching extensions: js,mjs,json
[nodemon] starting babel-node src/server.js
‘babel-node’ is not recognized as an internal or external command,
operable program or batch file.
[nodemon] app crashed - waiting for file changes before starting…