[Solved] You wrote this SAM template but deployment fails. What is the error?MyFunction: Type: AWS::Serverless::Function Properties: Handler: app.lambda_handler Runtime: python3.8 Events: S3Event: Type:... | AWS

AWS - Serverless Architecture

You wrote this SAM template but deployment fails. What is the error?

MyFunction:
  Type: AWS::Serverless::Function
  Properties:
    Handler: app.lambda_handler
    Runtime: python3.8
    Events:
      S3Event:
        Type: S3
        Properties:
          Bucket: my-bucket
          Events: s3:ObjectCreated:Put

AThe Runtime python3.8 is not supported

BThe Handler property is missing

CThe Events property under S3Event should be a list, not a string

DThe Bucket name cannot be hardcoded

Step-by-Step Solution

Solution:

Step 1: Check S3 event syntax
The Events property for S3 event must be a list of event types, but here it is a string.
Step 2: Verify other properties
Handler is present, python3.8 is supported, and bucket names can be hardcoded in SAM templates.
Final Answer:
The Events property under S3Event should be a list, not a string -> Option C
Quick Check:
S3 Events property = list, not string [OK]

Quick Trick: S3 Events must be a list, not a single string [OK]

Common Mistakes:

Using string instead of list for S3 Events
Removing required Handler property
Assuming runtime version is invalid without checking

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You wrote this SAM template but deployment fails. What is the error?

Step 1: Check S3 event syntax

Step 2: Verify other properties

Final Answer:

Quick Check:

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