Kernel Errors Present: EXT4-fs
Solution 1:
That's not actually an error: that's a log noting the current error count for the device within the specified timeframe (epoch time 1350482172 - 1350941030). Here's a more involved description of these lines by Ted Ts'o (ext2/3/4 maintainer). The long story made short is that LogWatch really shouldn't be alerting you on these lines; they're informational, and not indicative of a problem.