circleci with gcloud sdk UnicodeDecodeError

Before asking question, I wanna say that I've looked up every similar questions in stackoverflow, but everything was of no use.

I am experiencing a strange error recently.
I've used CircleCI as CI/CD tool to deploy my service to GCP app engine.

Recently, I realized that nodejs8 is now available for standard app engine. So I switched from flex app engine to standard app engine, and changed my app.yaml,
from

env: flex
runtime: nodejs
automatic_scaling:
min_num_instances: 1


to

runtime: nodejs8
instance_class: F2
automatic_scaling:
min_instances: 0


I only changed my app.yaml, but this error happens

Beginning deployment of service [default]...
ERROR: gcloud crashed (UnicodeDecodeError): 'ascii' codec can't decode byte 0xeb in position 14: ordinal not in range(128)

If you would like to report this issue, please run the following command:
gcloud feedback

To check gcloud for common problems, please run the following command:
gcloud info --run-diagnostics
Exited with code 1


I know that this is related to python. But I cannot understand why this error happens as I only changed app.yaml. Is this a bug of gcloud sdk, or CircleCI?

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