Decprecation Warning

Hi i am trying to use my raspberry pie 3 wit blynks. ihave followed the tutorial to get the app working with the raspberry pie i can connect but as soon as i press a button that is a dirrect link to the gpio i get a deprecation warning. i have tryed reinstalling node.js a few times but still no fix

(node:893) [DEP0013] DeprecationWarning: Calling an asynchronous function without callback is deprecated.

Try Google… this is not a Blynk issue.[DEP0013]+DeprecationWarning%3A+Calling+an+asynchronous+function+without+callback+is+deprecated

Also you can look as some very basic example I have posted with Blynk & NodeJS