Web upload example fails

[purplefox]

when run in IDE:

io.vertx.core.file.FileSystemException: java.nio.file.NoSuchFileException: /home/tim/projects/vert-x3/vertx-examples/web-examples/src/main/java/io/vertx/example/web/upload/file-uploads/686a502b-988a-4263-bb57-b66d2f25ed40
at io.vertx.core.file.impl.AsyncFileImpl.(AsyncFileImpl.java:104)
at io.vertx.core.file.impl.FileSystemImpl.doOpen(FileSystemImpl.java:744)
at io.vertx.core.file.impl.FileSystemImpl$14.perform(FileSystemImpl.java:738)
at io.vertx.core.file.impl.FileSystemImpl$14.perform(FileSystemImpl.java:735)
at io.vertx.core.impl.ContextImpl.lambda$executeBlocking$2(ContextImpl.java:281)
at io.vertx.core.impl.ContextImpl$$Lambda$24/907322897.run(Unknown Source)
at io.vertx.core.impl.OrderedExecutorFactory$OrderedExecutor.lambda$new$217(OrderedExecutorFactory.java:91)
at io.vertx.core.impl.OrderedExecutorFactory$OrderedExecutor$$Lambda$3/1452012306.run(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)
Caused by: java.nio.file.NoSuchFileException: /home/tim/projects/vert-x3/vertx-examples/web-examples/src/main/java/io/vertx/example/web/upload/file-uploads/686a502b-988a-4263-bb57-b66d2f25ed40
at sun.nio.fs.UnixException.translateToIOException(UnixException.java:86)
at sun.nio.fs.UnixException.rethrowAsIOException(UnixException.java:102)
at sun.nio.fs.UnixException.rethrowAsIOException(UnixException.java:107)
at sun.nio.fs.UnixFileSystemProvider.newAsynchronousFileChannel(UnixFileSystemProvider.java:196)
at java.nio.channels.AsynchronousFileChannel.open(AsynchronousFileChannel.java:248)
at io.vertx.core.file.impl.AsyncFileImpl.(AsyncFileImpl.java:101)
... 10 more