Don't know if this is your case but maybe it has to do with something that got updated within GH (newer versions)

I only managed to use Geometry Pipeline if I replace the "0" for the "*" character even though the layers are called 00, 01 etc

in short:

00 becomes **

and 01 becomes *1

Hi Ning,

Here are some things to check:

• Check closely the spelling of the name of the layer in the Pipeline component, it needs correspond exactly with the layer name you want to reference.
• Check that you have the correct geometry selected in the Type (right now you only have curves selected)
• Check if your geometry is drawn in the layers you're referencing.

Cheers!

Arie