[Jprogramming] Why appleintree verb don't working?

['Sergey Kamenev' via Programming]

Hi!

    ] y =: ((<1) ,<2) ,: (<<'abc'), <'bb'
┌─────┬──┐
│1    │2 │
├─────┼──┤
│┌───┐│bb│
││abc││  │
│└───┘│  │
└─────┴──┘
    (6 [ ]) applyintree(<1 1) y
┌─────┬─┐
│1    │2│
├─────┼─┤
│┌───┐│6│
││abc││ │
│└───┘│ │
└─────┴─┘

(6 [ ]) applyintree(1 0; 0) y

|length error
|   ((u applyintree(}.n))L:_1({.n)    {y)({.n)}y


Details for appleintree verb:
https://code.jsoftware.com/wiki/Vocabulary/AmendingBoxedStructures


Nice day!
Sergey