Compile error

The following error appears when attempting to compile my react app:

```
Failed to compile

./node_modules/react-regexr/lib/FlagsEditor.js
Module not found: Can't resolve 'react-bootstrap/lib/Overlay' in 'D:\...\node_modules\react-regexr\lib'
```

Perhaps this is a result of this project being 3+ years old and some dependencies are no longer compatible?