Traversing folders seems to be a problem

`let folders = Array(try Folder(path: "/xx/xx/").makeSubfolderSequence(recursive: true, includeHidden: false));`

This is the swift code, I'm not running in the main thread main, and when my files are less, it's no problem. But if I have more files (about 150), there will be a problem, and Xcode directly locate the error.

`CurrentChildIterator = childIteratorQueue.removeFirst()`

I can't understand what this is, and I hope to be able to get the solution.