How to deploy serverless file to AWS from bitbucket pipeline - amazon-web-services

Question

I am trying to deploy a serverless template using bitbucket pipeline. I have provided the sls deploy command as such sls deploy --stage ${environmentName} --cloudformationStackDynamoDB $dynamodbEventStoreStackName --componentName ${componentName} --partName ${partName} --eventBusName $eventBusName --region ${awsRegion} || exit
But I get this error when the pipeline reaches the step to deploy the serverless.yml file "Error:Cannot resolve serverless.yml: "service" property is not accessible (configured behind variables which cannot be resolved at this stage)"
Below is the content of serverless.yml
service:
name: ${opt:stage}-${opt:componentName}-${opt:partName}-stream
plugins:
- "#hewmen/serverless-plugin-typescript"
- serverless-plugin-resource-tagging
#- serverless-plugin-optimize
#- serverless-offline
# - serverless-plugin-warmup
# custom:
# # Enable warmup on all functions (only for production and staging)
# warmup:
# enabled: true
provider:
name: aws
runtime: nodejs16.x
stackName: ${self:service.name}
iamRoleStatements:
- Effect: Allow
Action:
- logs:Create*
- logs:Get*
Resource: "*"
- Effect: Allow
Action:
- dynamodb:*
Resource: "*"
- Effect: Allow
Action:
- events:PutEvents
Resource: "*" #TODO - apply pattern */eventbus-name
environment:
ENVIRONMENT: ${opt:stage}
COMPONENT_NAME: ${opt:componentName}
PART_NAME: ${opt:partName}
EVENTBUS_NAME: ${opt:eventBusName} #TODO - supply this as part of the CICD build
stackTags:
COMPONENT_NAME: ${opt:componentName}
STAGE: ${opt:stage}
functions:
default:
handler: src/lambda.streamHandler
name: ${self:provider.stackName}
events:
- stream: ${cf:${opt:cloudformationStackDynamoDB}.DynamoDBTableEventsStreamArn}
timeout: 30
I don't understand why the error says "service" property is not accessible because it is defined in the template file itself.
Any help would be appreciated.
Thanks!