Your archives have NOT been completed

Please excuse my English.
I install the plugin wp Time Machine version 3.4.0.

I followed the instructions here:
http://etuts.org/backup-wordpress-files-database-to-drop-box-with-wptimemachine-plugin/

Unfortunately, the data is backed up. I got this message:
Your archives have NOT been completed
Unfortunately more information is not available (yet). Note that wp Time Machine does not support Dropbox two step verification. 
 
 Remove this message

You me, please help?

Thanks a lot!

Ales

https://wordpress.org/plugins/wp-time-machine/