Error Adding a lambda function to a cloudfront distribution

Question

I have a basic cloudfront distribution that uses a s3 bucket as origin. But when I add a lambda function it shows the following error:

![Enter image description here](/media/postImages/original/IM1Q0NLx2SQk6j7jK4iPDC3w)

Here is the distribution configuration:

![Enter image description here](/media/postImages/original/IMTBFz44eOQMK-UP9sdaxRyw)
![Enter image description here](/media/postImages/original/IMIkXPU7ZzQJWLHRXeJ0Q5Jg)

![Enter image description here](/media/postImages/original/IMMEy3OSVlQzevDXHOf47LiQ)

![Enter image description here](/media/postImages/original/IM8XnmSMITSkWi60WZBFWLOQ)

And the function is set as the padrom for leading with cloudfront. The model is Modify HTTP response Header.

Answer

Hello.

What does the Lambda function do?  
Also, are the required IAM roles set for the Lambda function?  
https://docs.aws.amazon.com/AmazonCloudFront/latest/DeveloperGuide/lambda-edge-permissions.html

Error Adding a lambda function to a cloudfront distribution

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