Aws-Sam Local Invoke: Layer endpoint not found - amazon-web-services

Question

I'm trying to set up a local dev environment for my Lambda functions using SAM. I had everything working until I added a reference to a layer in my configuration.
I followed the instructions here: https://docs.aws.amazon.com/serverless-application-model/latest/developerguide/serverless-sam-cli-layers.html. I added my ARN for my layer version in my template.ymal as follows:
# template.ymal
TestLayerFunction:
Type: AWS::Serverless::Function
Properties:
FunctionName: TestLayer
Role: arn:aws:iam::111111111111:role/ReadStreamingTable
CodeUri: src/streaming/test-layer/
Handler: app.handler
Runtime: nodejs8.10
Layers:
- arn:aws:lambda:eu-west-1:111111111111:layer:Global:7
However when running a "sam local invoke" I get the following error:
botocore.exceptions.EndpointConnectionError: Could not connect to the endpoint URL:
"https://lambda.eu-west-1a.amazonaws.com/2018-10-31/layers/arn%3Aaws%3Alambda%3Aeu-west-1%3A111111111111%3Alayer%3AGlobal/versions/7"
The way I've added the layer ARN in the configuration seems to be exactly how they do it in the example so I'm not sure what is causing the error.

Answer 1

I know it's not exactly a solution but can you not have your layer as part of your SAM file?
If you have a look on this article on the AWS site they use both the layer and the lambda function on the same yaml file so you'd end up with something like this:
Resources:
TempConversionFunction:
Type: AWS::Serverless::Function
Properties:
CodeUri: hello-world/
Handler: app.lambdaHandler
Layers:
- !Ref TempConversionDepLayer
Events:
HelloWorld:
Type: Api
Properties:
Path: /{conversion}/{value}
Method: get
TempConversionDepLayer:
Type: AWS::Serverless::LayerVersion
Properties:
LayerName: sam-app-dependencies
Description: Dependencies for sam app [temp-units-conv]
ContentUri: dependencies/
CompatibleRuntimes:
- nodejs6.10
- nodejs8.10
LicenseInfo: 'MIT'
RetentionPolicy: Retain