failed proptype error

[eersoy84]

Hello,
I am trying to implement your component, but receiving Proptype error as follows

index.js:1 Warning: Failed prop type: t: prop type fontStyle is invalid; it must be a function, usually from the prop-types package, but received number.

Failed prop type: t: prop type fontWeight is invalid; it must be a function, usually from the prop-types package, but received number.

I am not passing any fontStyle or fontWeight props. I google it around but could not find a suitable answer.
Any help would be appreciated.
Thanks in advance