The Fileshare Server is unable to append to the current recovery log file and is also unable to back it up and so will not start. You should rectify the problem before trying to re-start the Fileshare Server.
Ensure that the filename and directory of the backup file are correct. Also ensure that there is enough disk space in the backup directory for the recovery log file to be copied.
If you are trying to start the Fileshare Server, this message can indicate that you are not following the correct sequence of backing up data files and removing recovery log files. See the section Rollforward Recovery Logging in the chapter Database Integrity for more details.