'One of the deployment parameters has an empty key' error while running the Pipeline

[edinc]

Please provide us with the following information:

This issue is for a: (mark with an x)

- [x] bug report -> please search issues before submitting
- [ ] feature request
- [ ] documentation issue or request
- [ ] regression (a behavior that used to work and stopped in a new release)

Minimal steps to reproduce

Following the Identify performance regressions by automating load tests with CI/CD tutorial the Pipeline fails at generating the Azure Load Test resource.

Any log messages given by the failure

Starting: AzureResourceManagerTemplateDeployment
==============================================================================
Task         : ARM template deployment
Description  : Deploy an Azure Resource Manager (ARM) template to all the deployment scopes
Version      : 3.210.1
Author       : Microsoft Corporation
Help         : https://docs.microsoft.com/azure/devops/pipelines/tasks/deploy/azure-resource-group-deployment
==============================================================================
ARM Service Connection deployment scope - Resource Group
Checking if the following resource group exists: sampleloadappecnortheurope-rg.
Resource group exists: true.
Creating deployment parameters.
The detected encoding for file '/home/vsts/work/1/s/ARMTemplate/template.json' is 'utf-8'
The detected encoding for file '/home/vsts/work/1/s/ARMTemplate/parameters.json' is 'utf-8'
There was an error while overriding '' parameter because of 'TypeError: Cannot read property 'type' of undefined', make sure it follows JavaScript Object Notation (JSON)
There was an error while overriding '' parameter because of 'TypeError: Cannot read property 'type' of undefined', make sure it follows JavaScript Object Notation (JSON)
There was an error while overriding '' parameter because of 'TypeError: Cannot read property 'type' of undefined', make sure it follows JavaScript Object Notation (JSON)
(node:1662) [DEP0005] DeprecationWarning: Buffer() is deprecated due to security and usability issues. Please use the Buffer.alloc(), Buffer.allocUnsafe(), or Buffer.from() methods instead.
Starting template validation.
Deployment name is template-20230127-154830-30b0
There were errors in your deployment. Error code: InvalidDeploymentParameterKey.
##[error]One of the deployment parameters has an empty key. Please see https://aka.ms/arm-create-parameter-file for details.
##[warning]Validation errors were found in the Azure Resource Manager template. This can potentially cause template deployment to fail. Task failed while creating or updating the template deployment.. Please follow https://docs.microsoft.com/en-us/azure/azure-resource-manager/templates/template-syntax
Starting Deployment.
Deployment name is template-20230127-154830-30b0
There were errors in your deployment. Error code: InvalidDeploymentParameterKey.
##[error]One of the deployment parameters has an empty key. Please see https://aka.ms/arm-create-parameter-file for details.
##[error]Check out the troubleshooting guide to see if your issue is addressed: https://docs.microsoft.com/en-us/azure/devops/pipelines/tasks/deploy/azure-resource-group-deployment?view=azure-devops#troubleshooting
##[error]Task failed while creating or updating the template deployment.
Finishing: AzureResourceManagerTemplateDeployment

Expected/desired behavior

The Pipeline should run successfully, creating the Azure Load Test resource.

OS and Version?

Azure Build Agent

Versions

ubuntu-latest

Mention any other details that might be useful

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