When I use the karma rendering image, Houdini tip【No orderedVars to specify channels for/Render/Products/renderproduct】
What does that mean? How should I change my render Settings?

I got the same error, my issue was trying to render an LOP setup through an outside Karma ROP. Instead you need to add a Karma render node inside the LOP.

Im having this error when editing my karmarendersettings with a renderproduct node.