ATI 2010 error "Specify location of volume..." ?

Win XP pro, ATI2010
Although the log shows a successful backup, it's terminating early and showing this message in the log: "Specify location of the volume 50." Any help would be appreciated.

Here's the full log from last night:
<?xml version="1.0" encoding="UTF-8" ?>

Create Incremental Backup Archive</bold><endl/><tabpoint value=30><indent value=4>From: <indent value=10><textcolor value="navyblue">Disk 1, Disk 2</textcolor></indent><indent value=4><endl/>To file: <indent value=10><textcolor value="navyblue">"E:\My Backups\7-1-121041.tib"</textcolor></indent><indent value=4><endl/>Compression: <indent value=10><textcolor value="navyblue">Normal</textcolor></indent><indent value=4><endl/></indent><endl/>" module="11" time="1381647616" />

Validate Backup Archive</bold><endl/><tabpoint value=30><indent value=4>Location: <indent value=10><textcolor value="navyblue">"E:\My Backups\7-1-121041.tib"</textcolor></indent><indent value=4><endl/></indent><endl/>" module="11" time="1381649456" />

Browse</bold> to specify volume location, <bold>Retry</bold> to try again, or click <bold>Cancel</bold>.: Retry//Cancel/" module="4" time="1381649626" />
Browse</bold> to specify volume location, <bold>Retry</bold> to try again, or click <bold>Cancel</bold>.: Retry//Cancel/: User response: Cancel" module="4" time="1381650226" />