Anthropic Claude Node

Im attempting to get the new Claude node to work (downloaded the workflow from the docs at Anthropic Claude API Node ComfyUI Official Example - ComfyUI), but I am getting this error (using the simple “Describe this image” prompt"):
**
ClaudeNode**

Anthropic Claude

Failed to convert an input value to a INT value

seed, randomize, invalid literal for int() with base 10: ‘randomize’

I am logged onto my Claude account - do I need to buy credits in ComfyUI as well as my Claude credits for this to work ?