Stack Creation Error

This error message is related to AWS Lambda and the concurrent executions of the function that you are trying to create as a part of the stack setup.

The error message is indicating that the number of concurrent executions you have specified for your Lambda function would result in a total number of concurrent executions that is below the minimum value of 10. In other words, the value of "ReservedConcurrentExecutions" that you have specified for your function would cause the number of concurrent executions available to your account to fall below 10.

To resolve this issue, you can either increase the value of "ReservedConcurrentExecutions" to a value that will result in a total number of concurrent executions above 10, or you can decrease the number of concurrent executions used by other functions in your account to free up more concurrency.

You can manage concurrency for your Lambda functions by using the "ReservedConcurrentExecutions" property in your function configuration. For more information on how to manage concurrency for your Lambda functions, please see the AWS Lambda documentation: https://docs.aws.amazon.com/lambda/latest/dg/concurrent-executions.html