Kevin,
the message in the picture is same text as below, and this is from Ola's  job log file

2017-04-20 13:04:24.90 Backup Error: 3041, Severity: 16, State: 1.
2017-04-20...

Thank You very much Kevin for your reply!

I just checked in the error log, the backups taken successfully for many databases and it failed for two DB's,
I assume failure for...