[App_rpt-users] Warning at CLI Prompt.

I keep getting the warning below when opening the -r CLI prompt and it keeps repeating until I exit out. Any idea what it is?? WARNING[9345]: app_gps.c:399 aprsthread: server second.aprs.net cannot be found!! DMK URI, Simpleusb.conf. Thanks.... __________ Information from ESET NOD32 Antivirus, version of virus signature database 9461 (20140223) __________ The message was checked by ESET NOD32 Antivirus. http://www.eset.com