Unexpected error when connecting Airport Express A1264 to Airport Utility 6.3.1

My current wireless setup is and has been the following:  Phone Jack --> DSL modem ---> Airport Express via Ethernet cable
Off of that connection we've been able to wirelessly run our MacBook, Apple TV and iPhones for several years.
We recently left for vacation, so I unplugged everything (apparently a huge mistake).  When we returned from vacation, the wireless connection was intermittent and kept being dropped.
If I connect the Ethernet cable directly from the modem into my MacBook the internet works fine.
I tried refreshing the Airport Express by unplugging it and cycling it through.  It continued to drop. 
By opening the Airport Utility, a firmware update was recommended.  However, since that update the Airport Express isn't detected anymore.
I tried a hard reset and Utility finds the Airport Express under "Other Wifi Devices" but then, at the end of trying to "Join the Airport Express to the Network" I get an "Unexpected Error" message.
Airport Express Model Number: A1264
Airport Utility: 6.3.1
OS: 10.8.5
I am very frustrated and way out of my league here with understanding how this all works and what I can do to fix it.  If anyone has any suggestions or expertise to offer, I would greatly appreciate it.
Thank you for your time,
Amanda

Hi AMM222,
"Unexpected Error" message with Mountain Lion and AirPort Utility 6.3.x.  Hopefully this is just a matter of enabling IPv6.
AirPort base station not seen or "An unexpected error occurred" appears in AirPort Utility 6.3
http://support.apple.com/kb/TS4597
This can happen if IPv6 has been disabled. To enable IPv6 for your network interface:
Choose Apple menu () > System Preferences, and then click Network.
If a lock icon appears in the lower-left corner, click it and enter your admin name and password to unlock the pane.
Click your network service (Wi-Fi or Ethernet) in the list, and then click Advanced.
Click the TCP/IP tab.
Choose Link-local only from the Configure IPv6 pop-up menu.
Click OK.
Click Apply.
The AirPort device should now appear in AirPort Utility.
Thank you for using Apple Support Communities.
Nubz

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