[CentOS] Strange error pop up on my box

I'm getting a strange error pop up on my box:

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No more mirrors are available

Required data could not be found on any of the configured software sources.
There were no more download mirrors that could be tried.

More details
failure: repodata/filelists.sqlite.bz2 from elrepo: [Errno 256] No more 
mirrors to try.
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How to figure out what's causing this error?

Linux mushroom.patch 2.6.32-279.22.1.el6.i686 #1 SMP Wed Feb 6 00:31:03 
UTC 2013 i686 i686 i386 GNU/Linux

Tail of dmesg:
hub 1-0:1.0: unable to enumerate USB device on port 7
usb 1-7: new high speed USB device number 7 using ehci_hcd
usb 1-7: New USB device found, idVendor=0781, idProduct=74d1
usb 1-7: New USB device strings: Mfr=1, Product=2, SerialNumber=3
usb 1-7: Product: SanDisk Sansa Clip+
usb 1-7: Manufacturer: SanDisk
usb 1-7: SerialNumber: 9C01F60D9554B7A80000000000000000
usb 1-7: configuration #1 chosen from 1 choice
Initializing USB Mass Storage driver...
scsi8 : SCSI emulation for USB Mass Storage devices
usb-storage: device found at 7
usb-storage: waiting for device to settle before scanning
usbcore: registered new interface driver usb-storage
USB Mass Storage support registered.
usb-storage: device scan complete
scsi 8:0:0:0: Direct-Access     SanDisk  Sansa Clip+ 4GB  v01. PQ: 0 ANSI: 0
scsi 8:0:0:1: Direct-Access     SanDisk  Sansa Clip+ 4GB  v01. PQ: 0 ANSI: 0
sd 8:0:0:0: Attached scsi generic sg3 type 0
sd 8:0:0:1: Attached scsi generic sg4 type 0
sd 8:0:0:0: [sdc] 7683072 512-byte logical blocks: (3.93 GB/3.66 GiB)
sd 8:0:0:0: [sdc] Write Protect is off
sd 8:0:0:0: [sdc] Mode Sense: 04 00 00 00
sd 8:0:0:0: [sdc] Assuming drive cache: write through
sd 8:0:0:0: [sdc] Assuming drive cache: write through
  sdc:
sd 8:0:0:1: [sdd] 61497344 512-byte logical blocks: (31.4 GB/29.3 GiB)
sd 8:0:0:0: [sdc] Assuming drive cache: write through
sd 8:0:0:0: [sdc] Attached SCSI removable disk
sd 8:0:0:1: [sdd] Write Protect is off
sd 8:0:0:1: [sdd] Mode Sense: 04 00 00 00
sd 8:0:0:1: [sdd] Assuming drive cache: write through
sd 8:0:0:1: [sdd] Assuming drive cache: write through
  sdd: sdd1
sd 8:0:0:1: [sdd] Assuming drive cache: write through
sd 8:0:0:1: [sdd] Attached SCSI removable disk
SELinux: initialized (dev sdc, type vfat), uses genfs_contexts
SELinux: initialized (dev sdd1, type vfat), uses genfs_contexts


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    ^ ^  Mark LaPierre
Registered Linux user No #267004
https://linuxcounter.net/
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