The development server returned response error code: 500 in react native

babel-preset-react-native make this trouble. Run below orders in your project root dir:

$yarn remove babel-preset-react-native

$yarn add [email protected]

try installing react-native-material-design locally instead of globally.

It looks like react-native-material-design depends on react-native-material-design-styles which won't be packaged by React Native's bundler since its parent is a global module.