Duplicate Symbol Error

Question

I\'m not sure what I did but I added an IBOutlet to display an additional attribute in a TableView cell. When building the application I get the following error message...

Answer 1

I had this problem . I solve it.

Because ı did mistake when ı import to viewcontroller .

mistake: #import "viewcontroller.m"

Later I edit : `#import "viewcontroller.h"

only I changed extension of viewcontroller .