Operation with partition error backing up for the first time

I am getting the following error when running a "My Computer" backup for the fist time.
Operation with partition "2-0" was terminated
Event# 10

Why am I getting this error?

I am running Vista Home Premium 32-bit

Here is a copy of the log:

<?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">SQ004585V03 (C:)</textcolor></indent><indent value=4><endl/>To file: <indent value=10><textcolor value="navyblue">"E:\Laptop.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="1255199484" />

Run list corrupted (0x7001C)
Tag = 0xEF8B1618A4C0DEBC</indent>" module="1" time="1255199764" />

Create Incremental Backup Archive</bold><endl/><tabpoint value=30><indent value=4>From: <indent value=10><textcolor value="navyblue">SQ004585V03 (C:)</textcolor></indent><indent value=4><endl/>To file: <indent value=10><textcolor value="navyblue">"E:\Laptop.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="1255200661" />

Run list corrupted (0x7001C)
Tag = 0xEF8B1618A4C0DEBC</indent>" module="1" time="1255200920" />