View Compilation Error

0_0_19231054_28313.cpp: In member function 'void Bookshelf::add(const Book&)':
0_0_19231054_28313.cpp:19:101: error: 'occupied_wid' was not declared in this scope
 const Book &book){        shelf.push_front(book);        occupied_width += book.width;        while(occupied_wid.h>
                                                                                                     ^