Zigbee2MQTT error after adding unsupported device: "Error: Cannot find module 'zigbee-herdsman-converters/lib/extend'"

Hi there,

I followed instructions (How to support new devices | zigbee2mqtt.io) for adding a new unsupported IKEA lamp to zigbee2mqtt but i’m getting the following error after restart: Error: Cannot find module ‘zigbee-herdsman-converters/lib/extend’. So I supposed that is all ok with the .js file added to external_converters in configuration.yaml.

Am I missing something?

Thanks.
Pedro.