Message: Cannot modify header information - headers already sent by (output started a

This error show up when add line input in view and controller like this
http://prntscr.com/dz1ah8 http://prntscr.com/dz1a8a and the result is http://prntscr.com/dz1axv


please help me, i don't know how to solve it.
i searched in stackoverflow, but there is no whitespace or etc