Unavailable Serverless Db Engine Mode Error

Question

I'm facing following issue when creating Serverless Aurora Postgres 14.5 Cluster using AWS CDK. I've also tested out different versions such as 15.2, 14.6, 14.7.
Error: 
"The engine mode serverless you requested is currently unavailable. "

```
self.aurora_serverless_db = rds.ServerlessCluster(
            self,
            "AuroraServerlessCluster",
            engine=rds.DatabaseClusterEngine.aurora_postgres(version=rds.AuroraPostgresEngineVersion.VER_14_5),
            vpc=self.vpc,
            vpc_subnets=ec2.SubnetSelection(subnet_type=ec2.SubnetType.PRIVATE_ISOLATED),
            default_database_name="serverless_db",
            backup_retention=Duration.days(1), 
            deletion_protection=True,
            enable_data_api=True, 
            parameter_group=rds.ParameterGroup.from_parameter_group_name( 
                self,
                "AuroraDBParameterGroup",
                "default.aurora-postgresql14"  
            ),
            scaling=rds.ServerlessScalingOptions(
                auto_pause=Duration.minutes(30),
                # Shutdown after minutes of inactivity to save costs
                min_capacity=rds.AuroraCapacityUnit.ACU_2,
                max_capacity=rds.AuroraCapacityUnit.ACU_4
            ),
        )
```

All is working well with `engine = rds.DatabaseClusterEngine.AURORA_POSTGRES` and `parameter_group ="default.aurora-postgresql10"`

Accepted Answer

ServerlessCluster(), I think Aurora Serverless V1 is running.  
With Aurora Serverless V1, only Aurora PostgreSQL 10 and 11 compatible versions can be configured.  
https://docs.aws.amazon.com/AmazonRDS/latest/AuroraUserGuide/aurora-serverless.relnotes.html

To use Aurora Postgres 14.5 compatible version, you must use Aurora Serverless V2.  
I think you have to force it to Aurora Serverless V2 with rds.DatabaseCluster() as described in the Issues here.  
https://github.com/aws/aws-cdk/issues/20197

Unavailable Serverless Db Engine Mode Error

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