View Compilation Error

0_0_21997661_10849.cpp: In member function 'Node Seg::UP(Node, Node, Node)':
0_0_21997661_10849.cpp:105:40: error: request for member 'rev' in 'tr', which is of non-class type 'Node [400020]'
         Node tmp = Node(ls.L, rs.R, tr.rev, ls.m*rs.m);
                                        ^