AWS Cloudformation

Hi, I need help in fixing the template. This is snippet of cloudformation template. Its creating the folder in the s3 bucket - datasource as required but Custom::S3CustomResource is stuck in CREATE_IN_PROGRESS. Please let know if there is a solution.

  S3CustomResource:
    Type: Custom::S3CustomResource
    Properties:
      ServiceToken: !GetAtt AWSLambdaFunction.Arn
      the_bucket: !Sub 'pe-ftv-${Environment}-dms-s3buckets'
  AWSLambdaFunction:
    Type: "AWS::Lambda::Function"
    Properties:
      FunctionName: !Sub 'pe-ftv-${Environment}-lambda'
      Handler: index.handler
      Role: !GetAtt AWSLambdaExecutionRole.Arn
      Timeout: 5
      Runtime: python3.9
      Code:
        ZipFile: |
          import boto3
          import cfnresponse
          def handler(event, context):
            bucket_name = event['ResourceProperties']['the_bucket']
            s_3 = boto3.client('s3')
            directory_name = "datasource"
            s_3.put_object(Bucket= bucket_name, Key=(directory_name+'/'))
            cfnresponse.send(event,
                                   context,
                                   cfnresponse.SUCCESS)
            return