Bamboo: Could not find token mapped to token name: token

[MahaAmin]

I am trying to install bamboo server with external MySQL database. 
Both on AWS:
- Bamboo server: ubuntu-16.04-lts ec2

- MySQL db: MySQL RDS.

The output of BambooHome/logs/atlassian-bamboo.log

```

Caused by: java.net.ConnectException: Connection timed out (Connection timed out)
at java.net.PlainSocketImpl.socketConnect(Native Method)
at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
at java.net.Socket.connect(Socket.java:607)
at com.mysql.jdbc.StandardSocketFactory.connect(StandardSocketFactory.java:211)
at com.mysql.jdbc.MysqlIO.<init>(MysqlIO.java:299)
... 41 more
2020-08-26 11:58:48,012 INFO [performSetupDatabaseConnectionBackgroundThread] [SetupDatabaseConnectionAction] Database configuration is invalid: {}
2020-08-26 12:00:28,531 INFO [performSetupDatabaseConnectionBackgroundThread] [SetupDatabaseConnectionAction] Validating database configuration...
2020-08-26 12:00:28,532 INFO [performSetupDatabaseConnectionBackgroundThread] [SetupDatabaseConnectionAction] Validating connection to url: [jdbc:mysql://bamboodb.cfcqt7jnoumh.us-east-2.rds.amazonaws.com/bamboo?autoReconnect=true]
2020-08-26 12:00:30,537 WARN [http-nio-8085-exec-2] [TokenHelper] Could not find token mapped to token name: token

```