[Serusers] About avp_db_store()

[chungyu]

Hi all,
I am trying to use avp_db_store() stores my table "contact" with caller uri

ex:
    table name: contact
   -----------------------------
  |  username | domain     |
   -----------------------------
  |                    |                |
   ----------------------------- 
  |                    |                |
   -----------------------------

 If (method=="INVITE"){
     avp_write("$ruri/username", "s:name");
     avp_db_store("$ruri", "s:name/contact");
     };

if the incoming call then save username and domain of caller in contact
caller:  bob at iptel.org 
=>
   -----------------------------
  |  username | domain     |
   -----------------------------
  |     bob        | iptel.org   |
   ----------------------------- 
  |                    |                |
   -----------------------------
 but not success, system reply 
ERROR:avpops:db_store: insert faild

Please help me in the problem
Thanks a lot in advance
chungyu
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