All, I am a bit stuck to complete the challenge of the Apply Service Layer Principles in Apex trail.
I have created what has been requested and tested it successfully but I keep getting the following error: 

Challenge Not yet complete... here's what's wrong: 
The Apex service does not appear to be closing cases correctly with the specified reason.

Any idea on how to debug and findout what is wrong?

Below you can see my code:

Class CaseService:

public class CaseService 
{
    public static void closeCases(Set<ID> cases, String closeReason)
    {
        System.debug('SKA - ' + cases);
        System.debug('SKA - ' + closeReason);
        List<Case> caseToUpdate = new List<Case>();
        for (Id caseId : cases)
        {
            Case c = new Case(Id = caseId);
            c.Reason = closeReason;
            c.Status = 'Closed'; 
            
            caseToUpdate.add(c);
        }
     
        update caseToUpdate;
        
    }
}

Class CaseCloseResource:

@RestResource(urlMapping='/case/*/close')
global class CaseCloseResource 
{
    @httpPost
    global static void closeCase(String closeReason)
    {
        System.debug('SKA - HTTPPOST - ' + closeReason + ' - ' + RestContext.request.requestURI);
         // Parse context
        RestRequest req = RestContext.request;
        String[] uriParts = req.requestURI.split('/');
        Id caseId = uriParts[2];
        // Call the service
        CaseService.closeCases(new Set<ID> { caseId }, closeReason);  
        
    }
}
 

All, I am a bit stuck to complete the challenge of the Apply Service Layer Principles in Apex trail.
I have created what has been requested and tested it successfully but I keep getting the following error: 

Challenge Not yet complete... here's what's wrong: 
The Apex service does not appear to be closing cases correctly with the specified reason.

Any idea on how to debug and findout what is wrong?

Below you can see my code:

Class CaseService:

public class CaseService 
{
    public static void closeCases(Set<ID> cases, String closeReason)
    {
        System.debug('SKA - ' + cases);
        System.debug('SKA - ' + closeReason);
        List<Case> caseToUpdate = new List<Case>();
        for (Id caseId : cases)
        {
            Case c = new Case(Id = caseId);
            c.Reason = closeReason;
            c.Status = 'Closed'; 
            
            caseToUpdate.add(c);
        }
     
        update caseToUpdate;
        
    }
}

Class CaseCloseResource:

@RestResource(urlMapping='/case/*/close')
global class CaseCloseResource 
{
    @httpPost
    global static void closeCase(String closeReason)
    {
        System.debug('SKA - HTTPPOST - ' + closeReason + ' - ' + RestContext.request.requestURI);
         // Parse context
        RestRequest req = RestContext.request;
        String[] uriParts = req.requestURI.split('/');
        Id caseId = uriParts[2];
        // Call the service
        CaseService.closeCases(new Set<ID> { caseId }, closeReason);  
        
    }
}
 

I am getting the below error while working on the below trail head:

https://trailhead.salesforce.com/en/communities/community_rollout_impl/community_rollout_impl_sharing

Expand Your Reach with Communities  Community Rollout Strategy
Create Sharing Rules
 
Error: Challenge Not yet complete... here's what's wrong: 
Your user does not have a "Role" setup. Please make sure you have a role assigned to your user in Salesforce.

I am not able to assign a Role to the user Edna Frank as she is a Community User. Not able to surpass this challenge.

Please provide any possible solutions to resolve it in same dev org.

Thanks,
Hari Kundrapu