Here are the results from that tool.
Microsoft Windows [Version 6.1.7601]
Copyright (c) 2009 Microsoft Corporation. All rights reserved.
C:\Users\Brandon>"C:\Users\Brandon\Desktop\Minecraft-Region-Fixer-v0.0.6\region-
fixer.exe" --verbose --delete-corrupted --delete-entities --entity-limit=100 "C:
\Users\Brandon\Desktop\Industrial MC & Buildcraft\Minecraft Server\world"
Welcome to Region Fixer!
Scanning directory...
Info: No nether dimension in the world directory.
There are 20 region files and 12 player files in the world directory.
#################### Scanning level.dat ####################
'level.dat'\ is redable
################## Scanning player files ###################
All player files are readable.
################## Scanning region files ###################
Scanned r.-1.-1.mcr (c: 0, w: 0, t: 1024)...................................
.... 1/20
Deleted 408 entities in chunk (15,14).
Deleted 395 entities in chunk (16,16).
Scanned r.-1.-2.mcr (c: 0, w: 6, t: 1024)...................................
.... 2/20
Scanned r.-1.-3.mcr (c: 0, w: 0, t: 970)....................................
.... 3/20
Scanned r.-1.-4.mcr (c: 0, w: 0, t: 257)....................................
.... 4/20
Scanned r.-1.0.mcr (c: 0, w: 0, t: 886)....................................
.... 5/20
Scanned r.-1.1.mcr (c: 0, w: 0, t: 24).....................................
.... 6/20
Scanned r.-2.-1.mcr (c: 0, w: 0, t: 362)....................................
.... 7/20
Scanned r.-2.-2.mcr (c: 0, w: 3, t: 870)....................................
.... 8/20
Deleted 246 entities in chunk (10,21).
Scanned r.-2.-3.mcr (c: 0, w: 1, t: 940)....................................
.... 9/20
Scanned r.-2.-4.mcr (c: 0, w: 0, t: 10).....................................
.... 10/20
Scanned r.-2.0.mcr (c: 0, w: 0, t: 105)....................................
.... 11/20
Scanned r.-3.-2.mcr (c: 0, w: 0, t: 159)....................................
.... 12/20
Scanned r.-3.-3.mcr (c: 0, w: 0, t: 386)....................................
.... 13/20
Scanned r.0.-1.mcr (c: 0, w: 0, t: 601)....................................
.... 14/20
Scanned r.0.-2.mcr (c: 0, w: 0, t: 401)....................................
.... 15/20
Scanned r.0.-3.mcr (c: 0, w: 0, t: 157)....................................
.... 16/20
Scanned r.0.0.mcr (c: 0, w: 0, t: 1012)...................................
.... 17/20
Scanned r.0.1.mcr (c: 0, w: 0, t: 211)....................................
.... 18/20
Scanned r.1.0.mcr (c: 0, w: 0, t: 86).....................................
.... 19/20
Scanned r.1.1.mcr (c: 0, w: 0, t: 19).....................................
.... 20/20
Found 0 corrupted and 10 wrong located chunks of a total of 9504
C:\Users\Brandon>
If you're sure it's a vanilla MC error then no big deal.