Failed to Mount

[jokazaki]

I've been getting a failed to mount backup error the past few days. Here's my log, any ideas?

| 01:30:17 AM | Info | SuperDuper!, 2.5 (84), path: /Applications/SuperDuper!.app, Mac OS 10.5.7 build 9J61 (i386)
| 01:30:17 AM | Info | Started on Fri, Jul 31, 2009 at 1:30 AM
| 01:30:17 AM | Info | Source Volume: Mac OS, mount: /, device: /dev/disk0s2, media: WDC WD3200BEKT-22F3T0, interconnect: Internal SATA, file system: "Journaled HFS+", OS: 10.5.7 (9J61), capacity: 297.77 GB, used: 147.51 GB, directories: 249189, files: 1034221, ejectable: NO, ACLs: Enabled
| 01:30:17 AM | Info | Target Image: /Volumes/Data/Backups/MacBookPro/Backup.sparseimage, name: Backup
| 01:30:17 AM | Info | Copy Mode : Smart Update
| 01:30:17 AM | Info | Copy Script : Backup - all files.dset
| 01:30:17 AM | Info | Transcript : BuildTranscript.plist
| 01:30:18 AM | Info | PHASE: 1. Prepare to Copy Files
| 01:30:18 AM | Info | ...ACTION: Preparing Mac OS
| 01:30:18 AM | Info | ......COMMAND => Verifying the integrity of volinfo.database
| 01:30:18 AM | Info | volinfo.database OK
| 01:30:18 AM | Info | ......COMMAND => Enabling permissions on Mac OS
| 01:30:18 AM | Info | Refreshing Disk Arbitration ...
| 01:30:18 AM | Info | ......COMMAND => Verifying that permissions are enabled for Mac OS
| 01:30:18 AM | Info | Permissions on '/' are enabled.
| 01:30:18 AM | Info | ...ACTION: Mounting Backup
| 01:30:18 AM | Info | ......COMMAND => Preparing Backup
| 01:30:18 AM | Info | ......COMMAND => Setting ownership and access modes for '/Volumes/Data/Backups/MacBookPro/Backup.sparseimage'
| 01:30:18 AM | Info | ......COMMAND => Mounting Backup
| 01:30:19 AM | Info | /dev/disk1 GUID_partition_scheme /dev/disk1s1 EFI /dev/disk1s2 Apple_HFS /Volumes/Backup
| 01:30:19 AM | Info | ......COMMAND => Mounting Backup
| 01:30:19 AM | Info | Waiting for Backup to mount.
| 01:30:21 AM | Info | Waiting for Backup to mount.
| 01:30:23 AM | Info | Waiting for Backup to mount.
| 01:30:25 AM | Info | Waiting for Backup to mount.
| 01:30:27 AM | Info | Waiting for Backup to mount.
| 01:30:27 AM | Error | Failed to mount 'Backup'

[dnanian]

Try ejecting the image that's already mounted and running again.