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The Real Scott Morrison
Issue with Building a Custom Record Page for Lightning Experience Test
I'm having an issue with the "Building a Custom Record Page for Lightning Experience". I definitely have the right components on the lightning page layout. I think it might be the "Feed" component since there is no longer a "Feed" component it's now called "Chatter Feed". I tried it from a fresh organization with the same result. I tried creating a custom component named "Feed" but that failed as well, likely because of the namespace.
here is same issue on this topic Please go to below link for your solution
https://developer.salesforce.com/forums/?id=906F0000000kDhKIAU
thanks