Module not found: Can't resolve 'react-router-dom' in 'C:\Users\suzan\OneDrive\Desktop\mathquestionbanks\mathquestionbanks\src' code example

Example 1: Module not found: Can't resolve 'react-router-dom'

npm install react-router-dom --save

Example 2: Can't resolve 'react-router-dom'

$ npm install --save react-router-dom