Animate is warning you that this type of gradient is not supported in HTML5 Canvas documents. Actually, this document only supports one kind of linear gradient.
But other than losing a bit of visual fidelity, your content should work normally.
I hope this helps.
I am planning to reuse models done in CS6 , that is just the issue I have encountered so far. Not sure if there will be more once I have tried animating it.
Thank you so much!