Failed to mount using disk images?

[dfbackup]

I am getting the same issue. The disk image is created by SuperDuper! but fails to mount. If I double click the image after superduper fails it will mount but if I run super duper again it fails with the same error. I also can not delete the disk image or unmount the network server until I log out and back into OSX. The file always seems to be busy. I have no problems with this setup on my G5 imac to the same drive.

System Specs: MacBook Pro Core Duo 2.16, 2GB Ram, 10.4.9, Wireless to Airport Extreme Disk (1TB Fantom USB)

Log contents are:

| 02:08:46 PM | Info | SuperDuper!, 2.1.4 (82), path: /Applications/SuperDuper!/SuperDuper!.app, Mac OS 10.4.9 build 8P2137 (i386)
| 02:08:46 PM | Info | Started on Wed, Mar 28, 2007 at 2:08 PM
| 02:08:46 PM | Info | Source Volume: Macintosh HD, mount: /, device: /dev/disk0s2, media: ST9100824AS, interconnect: Internal SATA, file system: "HFS+", OS: 10.4.9 (8P2137), capacity: 82.00 GB, used: 65.41 GB, directories: 145882, files: 829116, ejectable: NO, ACLs: Disabled
| 02:08:46 PM | Info | Target Image: /Volumes/drew/Drew-MBPro-UserFolder.sparseimage, name: Drew-MBPro-UserFolder
| 02:08:46 PM | Info | Copy Mode : Smart Update
| 02:08:46 PM | Info | Copy Script : Backup - user files.dset
| 02:08:46 PM | Info | Transcript : BuildTranscript.plist
| 02:08:47 PM | Info | PHASE: 1. Prepare to Copy Files
| 02:08:47 PM | Info | ...ACTION: Preparing Macintosh HD
| 02:08:47 PM | Info | ......COMMAND => Verifying the integrity of volinfo.database
| 02:08:47 PM | Info | volinfo.database OK
| 02:08:47 PM | Info | ......COMMAND => Enabling permissions on Macintosh HD
| 02:08:47 PM | Info | Refreshing Disk Arbitration ...
| 02:08:47 PM | Info | ......COMMAND => Verifying that permissions are enabled for Macintosh HD
| 02:08:47 PM | Info | Permissions on '/' are enabled.
| 02:08:47 PM | Info | ...ACTION: Mounting Drew-MBPro-UserFolder
| 02:08:47 PM | Info | ......COMMAND => Preparing Drew-MBPro-UserFolder
| 02:08:47 PM | Info | ......COMMAND => Setting ownership and access modes for '/Volumes/drew/Drew-MBPro-UserFolder.sparseimage'
| 02:08:47 PM | Info | ......COMMAND => Mounting Drew-MBPro-UserFolder
| 02:08:48 PM | Error | 2007-03-28 14:08:48.372 hdiutil[318] CFLog (21): dyld returns 2 when trying to load /Library/Plug-ins/DiskImages/VirtualPCDiskImagePlugin.bundle/Contents/MacOS/VirtualPCDiskImagePlugin