Announce: node-red-contrib-ui-heatmap (beta release)

I have create an IBM cloud account and installed the heatmap node.
Indeed I get the same error when the flow is deployed:

image

Have been trying a couple of things, but I have no clue how I could debug this. Does anybody have an idea how to get started here? E.g. can I change the source code of my node to add a debugger; statement somehow?