Problem regarding windows phone 8.1 apps development?

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VS2012

Windows-Phone-8

Hi,

I am developing a windows 8.1 silverlight app in visual studio 2013

I am able to run the app in debug mode . I am able to execute the app in Emulator.

I want to build it in release mode for publishing it in to the store . While I am trying to build it in release mode I am getting errors like in sompage.xaml some list (listbox name) does not exist in current context or some txtdob (textblock name) does not exist in current context .

Any help , What is the problem...