serverless error: "bucket already exist" while deploying to Gitlab - amazon-s3

Question

I am newbee to serverless stack,Following is the serverless.yml file. On deploying this in GitLab I get error as:
Serverless Error ---------------------------------------
An error occurred: S3XPOLLBucket - bucket already exists.
Serverless.yml file is :
service: sa-s3-resources
plugins:
- serverless-s3-sync
- serverless-s3-remover
custom:
basePath: sa-s3-resources
environment: ${env:ENV}
provider:
name: aws
stage: ${env:STAGE}
region: ${env:AWS_DEFAULT_REGION}
environment:
STAGE: ${self:provider.stage}
resources:
Resources:
S3XPOLLBucket:
Type: AWS::S3::Bucket
Properties:
BucketName: gs-sa-xpoll-file-${self:custom.environment}-${self:provider.stage}
S3JNLBucket:
Type: AWS::S3::Bucket
Properties:
BucketName: gs-sa-jnl-file-${self:custom.environment}-${self:provider.stage}

Answer 1

An Amazon S3 bucket name is globally unique, and the namespace is shared by all AWS accounts. This means that after a bucket is created, the name of that bucket cannot be used by another AWS account in any AWS Region until the bucket is deleted.
That means you have to choose a unique name that has not already chosen by someone else (or even you in a different development stack) globally
More details
https://docs.aws.amazon.com/AmazonS3/latest/dev/UsingBucket.html