exception Zip4j is in busy state

[XuXin007]

I appreciate the open source code you provided I like it very much.the problem i'm having. Zip all files in the current folder throw exception net.lingala.zip4j.exception.ZipException: invalid operation - Zip4j is in busy state. Below is the code I wrote I don't know where is the problem
private void forEachDirectory(File currentFile, ZipFile zipFile) throws ZipException { File[] listFiles = currentFile.listFiles(); if (listFiles != null) { for (File file : listFiles) { if (file.isDirectory()) { zipFile.addFolder(file); forEachDirectory(file, zipFile); } else { zipFile.addFile(file); } } } }