Dropbox upload issue

I can’t upload file to dropbox.

I’m stuck at:
[12-kwi-2014 19:10:10] 1. Try to send backup file to Dropbox …
[12-kwi-2014 19:10:13] Authenticated with Dropbox of user xxx xxx ([email protected])
[12-kwi-2014 19:10:13] Uploading to Dropbox …

I’ve already tried new beta version, same problem. First bar – 67%, second – 1%.

Thanks for help.

https://ww.wp.xz.cn/plugins/backwpup/