The base layer for theme-park-photos-chromakey lambda function in eu-central-1 is missing cv2 dependency

[mr-cell]

Hello, I'm following the current edition of AWS Serverless Innovator Island Workshops.

I have been following the steps described in Module 3 Subsection 1 of the workshops (as defined here: https://github.com/aws-samples/aws-serverless-workshop-innovator-island/blob/master/3-photos/1-chromakey/README.md).

However, it seems that the base layer for theme-park-photos-chromakey lambda function (as defined here: https://github.com/aws-samples/aws-serverless-workshop-innovator-island/blob/master/3-photos/1-chromakey/README.md in eu-central-1 - arn:aws:lambda:eu-central-1:678705476278:layer:Chromakey:1) is missing the cv2 dependency.

Sending a test event of:

{
  "Records": [
      {
          "s3": {
              "bucket": {
                  "name": "theme-park-backend-uploadbucket-1hnjnkn2kab67"
              },
              "object": {
                  "key": "green-screen-test.png"
              }
          }
      }
    ]
}

Results in following execution result:

{
  "errorMessage": "Unable to import module 'lambda_function': No module named 'cv2'",
  "errorType": "Runtime.ImportModuleError"
}

START RequestId: d0fcfed7-9a4c-4201-9f31-669fd1b82e70 Version: $LATEST
[ERROR] Runtime.ImportModuleError: Unable to import module 'lambda_function': No module named 'cv2'END RequestId: d0fcfed7-9a4c-4201-9f31-669fd1b82e70
REPORT RequestId: d0fcfed7-9a4c-4201-9f31-669fd1b82e70  Duration: 2.05 ms   Billed Duration: 100 ms Memory Size: 3008 MB    Max Memory Used: 53 MB  Init Duration: 119.05 ms    

Is this something you could verify?

[jbesw]

Can you double-check that you set the function runtime to Python 3.6 and not another version? This is the most common reason for this error. Thanks!

[mr-cell]

@jbesw thank you for the quick response - that was indeed the cause (I've set Python 3.8 as runtime env). After switching to Python3.6 the error is gone. Thanks, I'll go ahead and close the issue!