React Native: Command `run-ios` unrecognized

Question

I have two different ReactNative-Projects:

• a) a project from januar 2016
• b) a complete new react-native project from now (march 20th 2016)

Answer 1

I created a brand new react-native project using
$ react-native init projectName
and ran from root of the project
$ react-native run-ios
Everything worked fine and iOS simulator fired up as expected.

Than I installed prop-types node module using npm install prop-types --save. Re-ran $ react-native run-ios and ran into this error Command run-ios unrecognized

Solution: From the root of my project, removed node_module and re-installed modules using npm. Commands below

$ rm -rf node_modules/
$ npm install
$ react-native run-ios