Cannot read property 'launchAuthentication' of undefined

[maphongba008]

I got this issue, anyone know how to fix it?
React native: 0.34.1
My code:

<DigitsLoginButton buttonStyle={{
                            width: 100,
                            height: 100,
                            backgroundColor: 'red'
                        }} />

[brascene]

You're probably missing other DigitsLoginButton props. Having only buttonStyle is not enough, you must provide:

• ref='DigitsLoginButton'
• completion={this.completion}