Welcome to the Treehouse Community

Want to collaborate on code errors? Have bugs you need feedback on? Looking for an extra set of eyes on your latest project? Get support with fellow developers, designers, and programmers of all backgrounds and skill levels here with the Treehouse Community! While you're at it, check out some resources Treehouse students have shared here.

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and join thousands of Treehouse students and alumni in the community today.

Start your free trial

JavaScript React Basics (retired) Thinking in Components Loops and Lists in JSX

Posted by Matthew Aglibot
Matthew Aglibot
1,489 Points

Uncaught TypeError: Cannot read property 'shape' of undefined

I am getting an Error in declaring the shape of the array, and I cant find out why. Please help, thank you.

Application.propTypes = { title : React.PropTypes.string, players : React.PropTypes.arrayOf(React.Proptypes.shape({ name : React.PropTypes.string.isRequired, score : React.PropTypes.number.isRequired, })).isRequired, }

1 Answer

Ryan S
Ryan S
27,276 Points
Ryan S
Ryan S
27,276 Points

Hi Matthew,

You forgot to capitalize the 't' in 'types' in React.PropTypes.shape().