Cannot access /C:\urbackup. No such file or directory (code: 2)

here is my log information:
019-11-27 12:57:41: ERROR: Error in CQuery::Execute - cannot commit - no transaction is active Stmt: [END;]
2019-11-27 12:57:41: ERROR: SQL: cannot commit - no transaction is active Stmt: [END;]
2019-11-27 12:57:41: ERROR: LMDB: Failed to open LMDB database file (Permission denied)
2019-11-27 12:57:41: ERROR: LMDB error creating env
2019-11-27 12:57:41: ERROR: Could not create or open file entry index. Exiting.
2019-11-27 12:57:42: UrBackup Server start up complete.
2019-11-27 12:57:42: Server started up successfully!
2019-11-27 12:57:42: Looking for old Sessions… 0 sessions
2019-11-27 12:57:43: Downloading version file…
2019-11-27 12:57:43: Downloading version file…
2019-11-27 12:57:43: Downloading version file…
2019-11-27 12:57:43: Downloading server version info…
2019-11-27 12:57:43: Downloading dataplan database…
2019-11-27 12:57:44: ERROR: Cannot open “/C:\urbackup”: No such file or directory (2)
2019-11-27 12:57:58: ERROR: Cannot open “/C:\urbackup”: No such file or directory (2)

when I go to the web interface I get this:

The directory where UrBackup will save backups is inaccessible. Please fix that by modifying this folder in ‘Settings’ or by giving UrBackup rights to access this directory. (err_folder_not_found). No such file or directory (code: 2)

I am usin g FreeBSD. Urbackup-server installed in jail “backup”
the directory where i store my backup have these permission:
drwxrwxrwx 35 urbackup urbackup backup

I nedd help with a solution to this problem with permissions?
and where can I find in the setting to change the directory where I save my backups? because I think it is not only permissions, it is something eith the destination directory in the settings, but I couldn’t find it.