Error while opening file

[Sridhar S]

Hello,

I am working with DDD version 3.3.10. I am trying to trace Net-SNMP
version 5.2.1. Whenever I run the SNMP agent and open a file
'table_iterator.c' following line is getting displayed at the GDB
window. 

list table_iterator.c:1
Line 1 of "table_iterator.c" is at address 0x40130150
<netsnmp_get_table_iterator_handler> but contains no code.

Can any body help me to solve this problem. 

Thanks 
SrIdhar