custom anomaly detection

Hi,
I'm trying to this example in influxdata
https://docs.influxdata.com/kapacitor/v1.3/guides/anomaly_detection/
keep falling because the logs are given me an error
pen server: open service *udf.Service: failed to load process info for "tTest": error processing request of type info: global name 'udf_pb2' is not defined
Any help please

Start by reproducing the linked Kapacitor anomaly-detection example and inspect the custom UDF named "tTest". Trace the request that reports `udf_pb2` as undefined, then confirm the example's UDF service starts and processes the request without that error.

Written by the indexing model from the issue text.