SCSM 2012 Self-Service Portal Access Denied

If you're getting an error from Service Manager 2012 Self Service Portal which looks something like this:

Error: Access Denied

Here's how to resolve the issue:

1. Logout and Sign in as a Sharepoint Administrator.
2. From SCSM 2012 Portal, select Site Permissions (located on Sharepoint Tab).
3. You'll see a warning "This Web site inherits permissions from its parent (Team Site)". Select Manage Parent.
4. Select Grant Permissions.
5. Add the group/users of choice, to give general permissions, add the group Domain Users and make sure to tick/give Read Permissions. 

Basically, after installing Service Manager 2012 Web Parts, the only user that can access the Self-Service Portal is the Sharepoint Administrator. So make sure to add the required users to the list after installing the Web Parts.