Hi Chris - so the way Flow works is that you have some objects you want to morph.

So you select those objects you want to morph and then you need to pick 2 surfaces to define how the morphing will take place - you pick a base surface (usually a plane), and then a target surface.

So those are 3 different pieces that you need to have:

1 - objects to morph

2 - base plane surface

3 - target surface


The problem is that in your attached file you are missing the #2 base plane object, you seem to only have an object to morph and then a target.

You need to create a plane object that is positioned around your object that is being deformed to define the base position.

- Michael