Issue with default example

[zimml]

I'm trying to follow the guide to test with default example.
I have setted up everyhing in githb. When I try to terraform apply on example I got this error message:

│ Error: error setting Lambda Function (default-scale-up) concurrency: InvalidParameterValueException: Specified ReservedConcurrentExecutions for function decreases account's UnreservedConcurrentExecution below its minimum value of [10].
│ {
│   RespMetadata: {
│     StatusCode: 400,
│     RequestID: "0d42adda-e211-4db7-b3ea-9450bfa7dd8d"
│   },
│   Message_: "Specified ReservedConcurrentExecutions for function decreases account's UnreservedConcurrentExecution below its minimum value of [10]."
│ }
│ 
│   with module.runners.module.runners.aws_lambda_function.scale_up,
│   on ../../modules/runners/scale-up.tf line 1, in resource "aws_lambda_function" "scale_up":
│    1: resource "aws_lambda_function" "scale_up" {
│ 

As I'm quite new to AWS stuffs, I'm not sure if it try to say me that I don't have enough Concurrent Execution setted up in AWS or if I have an issue with what I'm trying to apply. It's not clear to me how I can correct this error..