The role defined for the function cannot be assumed by Lambda.

[nigeljames-tess]

Context

I was deploying a simple (admin) only django install to test zappa and the zappa init was fine but on my first run of zappa deploy dev I go the error in the title

Python 3.12

Expected Behavior

I expected to get through to Deployment complete

Actual Behavior

An error occurred (InvalidParameterValueException) when calling the CreateFunction operation: The role defined for the function cannot be assumed by Lambda.

Possible Fix

https://stackoverflow.com/a/37438525/2434654 this link suggested sleeping a few seconds so I tried it again and it got to Deployment complete.

Perhaps introduce a pause in the deployment after the upload to wait for the role to be ready if others have this issue.

Steps to Reproduce

1. Step up super basic django
2. set up database (possibly not required)
3. setup amazon account to deploy ( i used sso)
4. zappa init
5. zappa deploy dev

Your Environment

• Zappa version used: 0.59.0
• Operating System and Python version: MacOS 15.2
• The output of pip freeze:

argcomplete==3.5.3
asgiref==3.8.1
boto3==1.35.95
botocore==1.35.95
certifi==2024.12.14
cfn-flip==1.3.0
charset-normalizer==3.4.1
click==8.1.8
django==5.1.4
durationpy==0.9
hjson==3.1.0
idna==3.10
jmespath==1.0.1
kappa==0.6.0
markupsafe==3.0.2
pip==24.3.1
placebo==0.9.0
psycopg==3.2.3
psycopg-binary==3.2.3
python-dateutil==2.9.0.post0
python-slugify==8.0.4
pyyaml==6.0.2
requests==2.32.3
s3transfer==0.10.4
setuptools==75.8.0
six==1.17.0
sqlparse==0.5.3
text-unidecode==1.3
toml==0.10.2
tqdm==4.67.1
troposphere==4.8.3
typing-extensions==4.12.2
urllib3==2.3.0
werkzeug==3.1.3
wheel==0.45.1
zappa==0.59.0

• Link to your project (optional):
• Your zappa_settings.json:

{
    "dev": {
        "aws_region": "ap-southeast-2",
        "django_settings": "project.settings",
        "exclude": [
            "boto3",
            "dateutil",
            "botocore",
            "s3transfer",
            "concurrent"
        ],
        "profile_name": "default",
        "project_name": "unity",
        "runtime": "python3.12",
        "s3_bucket": "random-name"
    }
}

[ChangWeiHong]

"CreateFunction" I assume your access has no permission to create lambda function. Try to check your programmatic access role.

[galoo]

I'm having the exact same issue. The user deploying the lambda has the role CreateFunction. And same for me, if I wait a few seconds and retry, it's ok.

[galoo]

Actually, another workaround is to add a custom role :
https://github.com/zappa/Zappa?tab=readme-ov-file#custom-aws-iam-roles-and-policies-for-execution

That way, the execution role for the lambda is already created and no need to wait.

[github-actions]

Hi there! Unfortunately, this Issue has not seen any activity for at least 90 days. If the Issue is still relevant to the latest version of Zappa, please comment within the next 10 days if you wish to keep it open. Otherwise, it will be automatically closed.

[github-actions]

Hi there! Unfortunately, this Issue was automatically closed as it had not seen any activity in at least 100 days. If the Issue is still relevant to the latest version of Zappa, please open a new Issue.