Can't resolve 'react-placeholder' in 'C:\Users\Admin\proep2020-group-8\App\proep8\src\components\profile' code example
Example: module not found: can't resolve 'react' in 'c:\users\pavlos\desktop\reactjs\hwr\reactproject2\src'
type: npm install react
next command type : npm install react-dom
that's the solution.