Not able to deploy the cloudformation stack by following the deployment steps

I was able to follow till step 3. Can you please add deatiled steps on how to execute this setup. In 4th step, when I try to deploy the cloudformation template it says the the --parameter values are not specified properly.

1. Ensure that you have setup everything that is listed in the pre-requisites section
2. Download source code from this repo
3. Update the ecs-bg-params.json under iac/app/params folder with the values for resources listed in the pre-requisite section
4. Deploy the CodePipeline CloudFormation template under iac/pipeline/code-pipeline.yaml
5. The above CodePipeline template will create a Code Commit repository. Retrieve the repository clone url from the output of the CodePipeline stack deployed in step #4
6. Push the updated code to this code commit repository which will trigger the code pipeline. Wait till pipeline successfully deploys and then verify the application is functional by going to the application URL. The application URL can be obtained from the Output of the CloudFormation application infrastructure stack (ecsfargate-sampleapp-infra-stack) that is deployed by Code pipeline execution.