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Prateek Aneja 2Prateek Aneja 2 

Lightning Components

Whenever I update 'Update' in Lightning Components, I get this message "Lightning components require My Domain. Please contact your system administrator for more information". Please help me out with this.
ChicloudChicloud
Yeah. this is kind of a pita that makes you change your entire org just to be able to experiment with lightning. See this link https://help.salesforce.com/HTViewHelpDoc?id=domain_name_overview.htm
DeepthiDeepthi (Salesforce Developers) 
Hi Prateek,

According to Winter'16 release, you should enable "My Domain" for your organization, otherwise your Lightning tabs, components, and pages will get disabled.

I believe you didnt Deploy domain to the user. Hence, please go to the Setup --> Domain management --> My domain, check your domain is not deployed to your users. If not, you will find one button called as "Deploy to users".Please click that button and then your lightning app will run.

For more reference, please check the below link
https://devinthecloud.wordpress.com/2015/11/03/lightning-components-require-my-domain/ 

Hope this helps you!
Best Regards,
Deepthi