Implementé una aplicación en Ubuntu VPS. Cuando inicio la aplicación usando pm2 , aparece este error:

Módulo no encontrado: no se puede resolver 'react-is' en '/root/apps/eduxxi-meeting/client/node_modules/styled-components/dist'

Este es el package.json para mi proyecto:

 { "name": "client", "version": "0.1.0", "private": true, "proxy": "http://localhost:8000", "dependencies": { "@testing-library/jest-dom": "^4.2.4", "@testing-library/react": "^9.3.2", "@testing-library/user-event": "^7.1.2", "react": "^16.13.1", "react-dom": "^16.13.1", "react-router-dom": "^5.3.0", "react-scripts": "3.4.1", "simple-peer": "^9.11.0", "socket.io-client": "^4.3.2", "styled-components": "^5.3.3", "uuid": "^8.3.2" }, "scripts": { "start": "GENERATE_SOURCEMAP=false react-scripts start", "build": "GENERATE_SOURCEMAP=false react-scripts build", "test": "react-scripts test", "eject": "react-scripts eject" }, "eslintConfig": { "extends": "react-app" }, "browserslist": { "production": [ ">0.2%", "not dead", "not op_mini all" ], "development": [ "last 1 chrome version", "last 1 firefox version", "last 1 safari version" ] } }

Arranco la aplicación así:

 pm2 start npm --name "eduxxi-meeting-ui" -- run start

¿Qué me he perdido? Agradezco cualquier ayuda :)