Lambda function is triggered but fails about aws-maintenance HOT 5 CLOSED

Latest snapshot found: 'rds:dr4r6hb7p917va-2018-01-18-15-05' from 2018-01-18 15:06:09.565000+00:00
Latest snapshot found: 'rds:dr4r6hb7p917va-2018-01-18-15-05' from 2018-01-18 15:06:09.565000+00:00

15:12:16
Checking if 'dr4r6hb7p917va-us-east-1-rds:dr4r6hb7p917va-2018-01-18-15-05' already exists in target region
Checking if 'dr4r6hb7p917va-us-east-1-rds:dr4r6hb7p917va-2018-01-18-15-05' already exists in target region

15:12:16
dr4r6hb7p917va-us-east-1-rds:dr4r6hb7p917va-2018-01-18-15-05 is already copied to us-west-2
dr4r6hb7p917va-us-east-1-rds:dr4r6hb7p917va-2018-01-18-15-05 is already copied to us-west-2

15:12:17
No snapshots for database dr4r6hb7p917va found in target region: Exception Traceback (most recent call last): File "/var/task/index.py", line 101, in lambda_handler remove_old_snapshots(message['Source ID']) File "/var/task/index.py", line 68, in remove_old_snapshots raise Exception("No snapshots for database {} found in target region".format(instance_name)) Exception: No snapshots for
No snapshots for database dr4r6hb7p917va found in target region: Exception
Traceback (most recent call last):
File "/var/task/index.py", line 101, in lambda_handler
remove_old_snapshots(message['Source ID'])
File "/var/task/index.py", line 68, in remove_old_snapshots
raise Exception("No snapshots for database
{}
found in target region".format(instance_name))
Exception: No snapshots for database dr4r6hb7p917va found in target region```

{
  "Records": [
    {
      "EventVersion": "1.0",
      "EventSubscriptionArn": "arn:aws:sns:EXAMPLE",
      "EventSource": "aws:sns",
      "Sns": {
        "Type": "Notification",
        "MessageId": "abcd",
        "TopicArn": "arn:aws:sns:eu-west-1:123456789012:topic_name",
        "Subject": "RDS Notification Message",
        "Message": "{\"Event Source\":\"db-instance\",\"Event Time\":\"2017-12-26 22:34:07.882\",\"Identifier Link\":\"https://console.aws.amazon.com/rds/home?region=eu-west-1#dbinstance:id=database_name\",\"Source ID\":\"PUT_YOUR_RDS_NAME_HERE\",\"Event ID\":\"http://docs.amazonwebservices.com/AmazonRDS/latest/UserGuide/USER_Events.html#RDS-EVENT-0002\",\"Event Message\":\"Finished DB Instance backup\"}",
        "Timestamp": "2017-12-26T22:35:19.946Z",
        "SignatureVersion": "1",
        "Signature": "xxx",
        "SigningCertURL": "xxx",
        "UnsubscribeURL": "xxx"
      }
    }
  ]
}