ios - Collection View in Objective C -- unknown error -

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i following this tutorial. has me using nibs/xibs(?) opposed storyboards or programmatic approach. have followed tutorial until first build instead of compiling message in console , instead of proper collection view 200x200 cells 1 button crashing app if clicked.

unknown class _ttc4test3box in interface builder file.

i wonder if how setup xibs causing problem not familiar graphical elements in xcode xibs or storyboard.

i'd know how approach this. if more info needed can upload project github.

one of objects in nib has class name _ttc4test3box. check text field , if find 1 value, delete string.

enter image description here

as button, i'm guessing selector being executed on button tap isn't implemented. check action property of button in ib (or in code), , ensure method body exists. check target correct too.


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