Cannot copy file, file is in use

Macbook pro 13 mid 2009 with Yosemite fresh install. (i have the same problem with the old MacOSX).

When i try to copy a file, or a bunch of files, to the wdtvlivehub i have the message error "cannot copy file, the file is in use".

I try the following:

- in the wdtvlivehub activated the DNLA, WINDOWS and Itunes Server (and the linux).

- try both via wifi and ethernet

- repair permission on disk

- deactivate the show miniatures on the mac and on the wdtvlivehub

- drag & drop the file and cut e copy via keyboard or with the right click of the pad or mouse

- connect the wdtvlivehub via SMB, CIFS

- Try with AFP but i get a error message

- with an app i search for a program that block the file but it didn't find anything

-Basically i try everything suggest in this board and over the web but nothing resolve the problem.

The file sometimes been copied but i have to try a billion times....not so comfort in this.

What i have to do?

P.S. Sorry for my bad english.