Need help loading and traversing MIBs

Hi,

I am trying to build an agent that could load specified MIBs and then query
selected values. But when I try to print mib information via "print_mib" my
application crashes. I'm using this code to load MIB

 netsnmp_init_mib();
 read_all_mibs();
 snmp_set_mib_warnings(2);
 //struct tree *tr = netsnmp_read_module("CISCO-RHINO-MIB");
 struct tree *tr = read_mib("CISCO-RHINO-MIB.mib");

 //
 while(tr)
      {
       printf("%s\n",tr->label);
       tr = tr->next_peer;
      }

 FILE *f = fopen("test.txt","w");
 print_mib(f);
 fclose(f);

Using read_module instead of read_mib is practically the same, but
read_module  doesn't display any output, while read_mib will produce this
output
http://imgur.com/rbiieWf
When trying to print_mib to file the program then fails.

Any ideas what I did wrong here?

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