I've cloned your repo to my local system.
then update a details SSL_KEY, SLS_SECRET, STAGE, REGION, BUCKET in secrets.env file.
I want to use node version 10 so I change it to bucket/serverless.yml and functions/serverless.yml and Dockerfile.
At last, I run command docker-compose up --build
I kept en eye on the output of a docker-compose command and everything is set up nicely.
it has created 2 S3 bucket image-resize-on-the-fly-serverlessdeploymentbuck-15sulaxg0lhop, image-resize-on-the-fly-serverlessdeploymentbuck-2lofzjreudgm and one bucket that I updated in secrets.env file to store images. two cloudformation stacks image-resize-on-the-fly-bucket-dev and image-resize-on-the-fly-functions-dev and one lambda function.
then I upload an image to S3 bucket. : S3_BUCKET_URL/image.jpg and I can access this URL.
Then I tried S3_BUCKET_URL/500x500/image.jpg but it's given me an error and I've attached error screen. it's not creating resize image.
Any help would be grateful.

I've cloned your repo to my local system.
then update a details
SSL_KEY, SLS_SECRET, STAGE, REGION, BUCKETinsecrets.envfile.I want to use node version 10 so I change it to
bucket/serverless.ymlandfunctions/serverless.ymlandDockerfile.At last, I run command
docker-compose up --buildI kept en eye on the output of a docker-compose command and everything is set up nicely.
it has created 2 S3 bucket
image-resize-on-the-fly-serverlessdeploymentbuck-15sulaxg0lhop,image-resize-on-the-fly-serverlessdeploymentbuck-2lofzjreudgmand one bucket that I updated insecrets.envfile to store images. two cloudformation stacksimage-resize-on-the-fly-bucket-devandimage-resize-on-the-fly-functions-devand one lambda function.then I upload an image to S3 bucket. :
S3_BUCKET_URL/image.jpgand I can access this URL.Then I tried
S3_BUCKET_URL/500x500/image.jpgbut it's given me an error and I've attached error screen. it's not creating resize image.Any help would be grateful.