"unexpected error" when connecting to Express after reset

Hi, I had a Time Capsule connected wirelessly to two Airport Expresses - one to extend the network and the other to stream music.  Recently I had to replace my old iMac and at the same time I upgraded the Time Capsule to the new 3Tb model.  The iMac is the 27" late 2013 i7 running the latest release of Mavericks.  the iMac is connected to the Time Capsule via ethernet cable.
I'm trying to reinstate the configuration I was using but am having trouble connecting to the Express.
I do a factory reset of the Express.  Amber light flashes slowly.
I turn wifi on on the iMac, click the icon and select the airport express from the drop down menu.  Airport Utility starts gathering information, then says it's joining, then examining base stations on my network and then "An unexpected error occurred.  Try again".  Trying again doesn't help. 
Curiously I get a message from Norton Vulnerability protection that it has blocked an ARP Cache poison attack.  Turning off Norton Vulnerability doesn't help.
Any suggestions?
Regards,
Todd

The "unexpected error occurred" is decidedly unhelpful. All that AirPort Utility knows is that something is preventing communication with the Express, for reasons that it cannot determine.
What model number Express do you have? Examine its case for a four digit model number preceded by the letter A. The model number is in the red box shown below:
Turning on Norton Vulnerability can't help either. Uninstall that worthless garbage completely, so that your Mac can work as designed. ARP Cache poison attack, my posterior.

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