simple socket server elf download fail

I have a bespoke cyclone V board running Altera's simple socket server design. I have modded the design so the mac address and IP address are hard coded. when downloading the elf I get a error message about tcpinit. and drtap- needs breakpoint (as per the attached picture). Any ideas what the errors mean?

http://www.alteraforum.com/forum/attachment.php?attachmentid=11452&stc=1