Backup error to Backblaze

Hi, I have a backup error problem. Here is a log file. Is anybody can read from the log what can be a problem, please?
I start to back up to Backblaze.
Thank you
log (1.5 KB)

Unable to read data from the transport connection: The connection was closed.

What version of Duplicati are you using?
If you’re using it on a non-Windows system, what version of mono are you using?