How to mountain AFP for backup target?

[Dewdman42]

well I tried that several times and its not mounting the AFP volume. This is the log:

| 10:12:57 PM | Info | ......COMMAND => Preparing mbp-dewd-10-6-full
| 10:12:57 PM | Info |       Finished verify/repair permissions on disk0s2 Boot
| 10:12:57 PM | Info | ...ACTION: Mounting mbp-dewd-10-6-full
| 10:12:57 PM | Info | ......COMMAND => Preparing mbp-dewd-10-6-full
| 10:12:59 PM | Info |       hdiutil: create failed - No such file or directory
| 10:12:59 PM | Error | ****FAILED****: result=256 errno=22 (Unknown error: 0)

If I manually mount the AFP volume first, then the backup runs fine.

Is there a way I can add something to the actual scheduled script to make sure the volume will be mounted? I am able to mount the volume from finder without having to supply any credentials, so I guess it must be in the keychain.