waitClick no longer exists?

powerUpButtonRegion:waitClick(Pattern("powerUp1.png"):similar(0.6), 1)
Is throwing up an error when I run it stating that there is no such method

Edit 1: I am wildly confused, why on earth am I getting the error 

"runtime error: Invalid method call. No such method.
stack traceback:
[C]: in function 'existsClick'"

I'm using this function in other bots. I have commonLib = loadstring(httpGet("https://raw.githubusercontent.com/AnkuLua/commonLib/master/commonLib.lua"))() at the top of the code. I've got no idea why it's not allowing me to use existsClick >.>

Edit 2: I guess I cannot add region data to waitClick? I'm confused why removing the region data makes any difference.