this is why i don't code..... I don't understand it



I'm working on Create a Lightning Compnent..... any help would be appreciated. 

Thanks!

I'm working through the "Render and Preview the Contact List" lesson of the 'Quick Start: Lightning Components" Module in Trailhead. I get the error message "The 'MyContactListApp' app does not contain the 'MyContactList' component" when I attempt to add the "MyContactListApp" This message shows up as well: "The Lightning Bundle name 'MyContactListApp' is already defined. Please choose a different name." How do I find it? I must have created it??? it is not in the dev tabs but mycontact...cmp, .svg everything but is listed. I need it to add the following code: "<c:MyContactList /> ". I'm super green in this area and have no idea how to work this problem. Any help is much appreciated! Many thanks! Larry

Trying to verify the first step of 
Quick Start: Lightning ComponentsCreate a Server-side Apex Controller Class and get the following error: Please advise. Thanks!