mxnet_gcmc.ipynb failed CI

Link to the notebook:
https://github.com/aws/amazon-sagemaker-examples/blob/master/sagemaker-python-sdk/dgl_gcmc/mxnet_gcmc.ipynb

Error:

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Exception encountered at "In [4]":
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[...]

CalledProcessError: Command 'b'account=$(aws sts get-caller-identity --query Account --output text)\necho $account\nregion=$(aws configure get region)\n\ndocker_name=sagemaker-dgl-gcmc\n\n$(aws ecr get-login --no-include-email --region ${region} --registry-ids 763104351884)\ndocker build -t $docker_name -f GCMC.Dockerfile .\n\n# Get the login command from ECR and execute it directly\n$(aws ecr get-login --region ${region} --no-include-email)\n\nfullname="${account}.dkr.ecr.${region}.amazonaws.com/${docker_name}:latest"\n# If the repository doesn\'t exist in ECR, create it.\naws ecr describe-repositories --repository-names "${docker_name}" > /dev/null 2>&1\nif [ $? -ne 0 ]\nthen\n aws ecr create-repository --repository-name "${docker_name}" > /dev/null\nfi\n\ndocker tag ${docker_name} ${fullname}\n\ndocker push ${fullname}\n'' returned non-zero exit status 1.

Start with sagemaker-python-sdk/dgl_gcmc/mxnet_gcmc.ipynb, especially cell In [4], and inspect the AWS CLI and Docker commands shown in the failure. Reproduce the CI error in the notebook's environment and determine why the command exits with status 1; done means the notebook completes successfully in CI.

Written by the indexing model from the issue text.