sam build fails in Decoupled Microservices Lab Scatter-Gather Lab 3

[indranilbanerjee2014]

In the Decoupled Microservices Lab, sam build command fails in the 3rd lab Scatter-Gather - https://async-messaging.workshop.aws/scatter-gather.html

Below is the error I get

indranil:~/environment/wild-rydes-async-messaging/lab-3 $ sam build
Building codeuri: request-for-quotes-service/ runtime: python3.7 metadata: {} functions: ['RequestForQuotesService']
Running PythonPipBuilder:ResolveDependencies

Build Failed
Error: PythonPipBuilder:ResolveDependencies - list index out of range

template.yaml file is pasted below

AWSTemplateFormatVersion: '2010-09-09'
Transform: AWS::Serverless-2016-10-31
Description: >
re:invent2019 ARC314-R Lab-3

Sample SAM Template for re:invent2019 ARC314-R Lab-3

More info about Globals: https://github.com/awslabs/serverless-application-model/blob/master/docs/globals.rst

Globals:
Function:
Timeout: 70

Resources:
RequestForQuotesService:
Type: AWS::Serverless::Function # More info about Function Resource: https://github.com/awslabs/serverless-application-model/blob/master/versions/2016-10-31.md#awsserverlessfunction
Properties:
CodeUri: request-for-quotes-service/
Handler: app.lambda_handler
Runtime: python3.7
Environment:
Variables:
TABLE_NAME: !Ref RidesBookingTable
TOPIC_ARN: !Ref RequestForQuotesTopic
Policies:
- DynamoDBCrudPolicy: # https://github.com/awslabs/serverless-application-model/blob/develop/samtranslator/policy_templates_data/policy_templates.json
TableName:
!Ref RidesBookingTable
- SNSPublishMessagePolicy: # https://github.com/awslabs/serverless-application-model/blob/develop/samtranslator/policy_templates_data/policy_templates.json
TopicName:
!GetAtt RequestForQuotesTopic.TopicName
Events:
RideBooking:
Type: Api # More info about API Event Source: https://github.com/awslabs/serverless-application-model/blob/master/versions/2016-10-31.md#api
Properties:
Path: /submit-instant-ride-rfq
Method: post

QueryForQuotesService:
Type: AWS::Serverless::Function # More info about Function Resource: https://github.com/awslabs/serverless-application-model/blob/master/versions/2016-10-31.md#awsserverlessfunction
Properties:
CodeUri: query-for-quotes-service/
Handler: app.lambda_handler
Runtime: python3.7
Environment:
Variables:
TABLE_NAME: !Ref RidesBookingTable
TOPIC_ARN: !Ref RequestForQuotesTopic
Policies:
- DynamoDBCrudPolicy: # https://github.com/awslabs/serverless-application-model/blob/develop/samtranslator/policy_templates_data/policy_templates.json
TableName:
!Ref RidesBookingTable
- SNSPublishMessagePolicy: # https://github.com/awslabs/serverless-application-model/blob/develop/samtranslator/policy_templates_data/policy_templates.json
TopicName:
!GetAtt RequestForQuotesTopic.TopicName
Events:
RideBooking:
Type: Api # More info about API Event Source: https://github.com/awslabs/serverless-application-model/blob/master/versions/2016-10-31.md#api
Properties:
Path: /query-instant-ride-rfq/{id}
Method: get

RidesBookingTable:
Type: AWS::DynamoDB::Table
Properties:
TableName: RidesBookingTable
AttributeDefinitions:
- AttributeName: id
AttributeType: S
- AttributeName: responder
AttributeType: S
KeySchema:
- AttributeName: id
KeyType: HASH
- AttributeName: responder
KeyType: RANGE
BillingMode: PAY_PER_REQUEST

RequestForQuotesTopic:
Type: AWS::SNS::Topic
Properties:
TopicName: request-for-quotes-topic

RequestForQuotesResponseQueue:
Type: AWS::SQS::Queue
Properties:
QueueName: RequestForQuotesResponseQueue
VisibilityTimeout: 120

UnicornManagementResource1:
Type: AWS::Serverless::Function
Properties:
CodeUri: generic-unicorn-management-service/
Handler: app.lambda_handler
Runtime: python3.7
Environment:
Variables:
SERVICE_NAME: UnicornManagementResource1
QUEUE_URL: !Ref RequestForQuotesResponseQueue
Policies:
- SQSSendMessagePolicy: # https://github.com/awslabs/serverless-application-model/blob/develop/samtranslator/policy_templates_data/policy_templates.json
QueueName:
!GetAtt RequestForQuotesResponseQueue.QueueName
Events:
SqsJobQueue:
Type: SNS
Properties:
Topic: !Ref RequestForQuotesTopic

UnicornManagementResource2:
Type: AWS::Serverless::Function
Properties:
CodeUri: generic-unicorn-management-service/
Handler: app.lambda_handler
Runtime: python3.7
Environment:
Variables:
SERVICE_NAME: UnicornManagementResource2
QUEUE_URL: !Ref RequestForQuotesResponseQueue
Policies:
- SQSSendMessagePolicy: # https://github.com/awslabs/serverless-application-model/blob/develop/samtranslator/policy_templates_data/policy_templates.json
QueueName:
!GetAtt RequestForQuotesResponseQueue.QueueName
Events:
SqsJobQueue:
Type: SNS
Properties:
Topic: !Ref RequestForQuotesTopic

UnicornManagementResource3:
Type: AWS::Serverless::Function
Properties:
CodeUri: generic-unicorn-management-service/
Handler: app.lambda_handler
Runtime: python3.7
Environment:
Variables:
SERVICE_NAME: UnicornManagementResource3
QUEUE_URL: !Ref RequestForQuotesResponseQueue
Policies:
- SQSSendMessagePolicy: # https://github.com/awslabs/serverless-application-model/blob/develop/samtranslator/policy_templates_data/policy_templates.json
QueueName:
!GetAtt RequestForQuotesResponseQueue.QueueName
Events:
SqsJobQueue:
Type: SNS
Properties:
Topic: !Ref RequestForQuotesTopic

UnicornManagementResource4:
Type: AWS::Serverless::Function
Properties:
CodeUri: generic-unicorn-management-service/
Handler: app.lambda_handler
Runtime: python3.7
Environment:
Variables:
SERVICE_NAME: UnicornManagementResource4
QUEUE_URL: !Ref RequestForQuotesResponseQueue
Policies:
- SQSSendMessagePolicy: # https://github.com/awslabs/serverless-application-model/blob/develop/samtranslator/policy_templates_data/policy_templates.json
QueueName:
!GetAtt RequestForQuotesResponseQueue.QueueName
Events:
SqsJobQueue:
Type: SNS
Properties:
Topic: !Ref RequestForQuotesTopic

UnicornManagementResource5:
Type: AWS::Serverless::Function
Properties:
CodeUri: generic-unicorn-management-service/
Handler: app.lambda_handler
Runtime: python3.7
Environment:
Variables:
SERVICE_NAME: UnicornManagementResource5
QUEUE_URL: !Ref RequestForQuotesResponseQueue
Policies:
- SQSSendMessagePolicy: # https://github.com/awslabs/serverless-application-model/blob/develop/samtranslator/policy_templates_data/policy_templates.json
QueueName:
!GetAtt RequestForQuotesResponseQueue.QueueName
Events:
SqsJobQueue:
Type: SNS
Properties:
Topic: !Ref RequestForQuotesTopic

UnicornManagementResource6:
Type: AWS::Serverless::Function
Properties:
CodeUri: generic-unicorn-management-service/
Handler: app.lambda_handler
Runtime: python3.7
Environment:
Variables:
SERVICE_NAME: UnicornManagementResource6
QUEUE_URL: !Ref RequestForQuotesResponseQueue
Policies:
- SQSSendMessagePolicy: # https://github.com/awslabs/serverless-application-model/blob/develop/samtranslator/policy_templates_data/policy_templates.json
QueueName:
!GetAtt RequestForQuotesResponseQueue.QueueName
Events:
SqsJobQueue:
Type: SNS
Properties:
Topic: !Ref RequestForQuotesTopic

UnicornManagementResource7:
Type: AWS::Serverless::Function
Properties:
CodeUri: generic-unicorn-management-service/
Handler: app.lambda_handler
Runtime: python3.7
Environment:
Variables:
SERVICE_NAME: UnicornManagementResource7
QUEUE_URL: !Ref RequestForQuotesResponseQueue
Policies:
- SQSSendMessagePolicy: # https://github.com/awslabs/serverless-application-model/blob/develop/samtranslator/policy_templates_data/policy_templates.json
QueueName:
!GetAtt RequestForQuotesResponseQueue.QueueName
Events:
SqsJobQueue:
Type: SNS
Properties:
Topic: !Ref RequestForQuotesTopic

UnicornManagementResource8:
Type: AWS::Serverless::Function
Properties:
CodeUri: generic-unicorn-management-service/
Handler: app.lambda_handler
Runtime: python3.7
Environment:
Variables:
SERVICE_NAME: UnicornManagementResource8
QUEUE_URL: !Ref RequestForQuotesResponseQueue
Policies:
- SQSSendMessagePolicy: # https://github.com/awslabs/serverless-application-model/blob/develop/samtranslator/policy_templates_data/policy_templates.json
QueueName:
!GetAtt RequestForQuotesResponseQueue.QueueName
Events:
SqsJobQueue:
Type: SNS
Properties:
Topic: !Ref RequestForQuotesTopic

UnicornManagementResource9:
Type: AWS::Serverless::Function
Properties:
CodeUri: generic-unicorn-management-service/
Handler: app.lambda_handler
Runtime: python3.7
Environment:
Variables:
SERVICE_NAME: UnicornManagementResource9
QUEUE_URL: !Ref RequestForQuotesResponseQueue
Policies:
- SQSSendMessagePolicy: # https://github.com/awslabs/serverless-application-model/blob/develop/samtranslator/policy_templates_data/policy_templates.json
QueueName:
!GetAtt RequestForQuotesResponseQueue.QueueName
Events:
SqsJobQueue:
Type: SNS
Properties:
Topic: !Ref RequestForQuotesTopic

UnicornManagementResource10:
Type: AWS::Serverless::Function
Properties:
CodeUri: generic-unicorn-management-service/
Handler: app.lambda_handler
Runtime: python3.7
Environment:
Variables:
SERVICE_NAME: UnicornManagementResource10
QUEUE_URL: !Ref RequestForQuotesResponseQueue
Policies:
- SQSSendMessagePolicy: # https://github.com/awslabs/serverless-application-model/blob/develop/samtranslator/policy_templates_data/policy_templates.json
QueueName:
!GetAtt RequestForQuotesResponseQueue.QueueName
Events:
SqsJobQueue:
Type: SNS
Properties:
Topic: !Ref RequestForQuotesTopic

QuotesResponseService:
Type: AWS::Serverless::Function
Properties:
CodeUri: quotes-response-service/
Handler: app.lambda_handler
Runtime: python3.7
Environment:
Variables:
TABLE_NAME: !Ref RidesBookingTable
Policies:
- DynamoDBCrudPolicy: # https://github.com/awslabs/serverless-application-model/blob/develop/samtranslator/policy_templates_data/policy_templates.json
TableName:
!Ref RidesBookingTable
Events:
SQSQueue:
Type: SQS
Properties:
Queue: !GetAtt RequestForQuotesResponseQueue.Arn
BatchSize: 1

Outputs:
RideBookingApiSubmitInstantRideRfqEndpoint:
Description: "API Gateway endpoint URL for Prod stage for RideBookingService submit-instant-ride-rfq resource"
Value: !Sub "https://${ServerlessRestApi}.execute-api.${AWS::Region}.amazonaws.com/Prod/submit-instant-ride-rfq/"
RideBookingApiQueryInstantRideRfqEndpoint:
Description: "API Gateway endpoint URL for Prod stage for RideBookingService query-instant-ride-rfq resource"
Value: !Sub "https://${ServerlessRestApi}.execute-api.${AWS::Region}.amazonaws.com/Prod/query-instant-ride-rfq/{id}"

RideBookingService:

Description: "RideBookingService Lambda Function ARN"

Value: !GetAtt RideBookingService.Arn

RequestForQuotesTopic:
Description: "Amazon SNS topic ARN for RequestForQuotes topic"
Value: !Ref RequestForQuotesTopic