Code along Error: TypeError: undefined is not an object (evaluating '_reactNativeRsaUtil2.default.encryptStringWithPublicKey') 

Hi, 

I'm using your code example from here: https://www.npmjs.com/package/react-native-rsa-util

and get the following error when trying the encryptStringWithPublicKey code example.

`TypeError: undefined is not an object (evaluating '_reactNativeRsaUtil2.default.encryptStringWithPublicKey') `

Any idea of what might cause it?

Thanks, 
Hugo