A few times in the past 3 months I’ve been getting this error when using TweenMax:
1061: Call to a possibly undefined method roundProps through a reference with static type Class.
It was perplexing the crap out of me, most recently when trying to use TweenMax in a project that previously was only using TweenNano. Turns out the solution is simple, I just downloaded the most recent version of TweenMax (duh), replaced all the files in the “com.greensock” folder and it was fixed. Just posting here in case I (or anyone else) encounter it again.