$dbh->prepare() problem

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$sth=3D$dbh->prepare("insert into ivr =
(drv_dlv_dt,drv_dlv_tm,drv_flag_cln,drv_flag_sti,drv_flag_at d,drv_id,drv_=
flag,ld_nbr,cal_nbr,cal_flg,channel,unq_id,caller_id,comment ,shpdt) =
values =
(\'$c_dlvdt\',\'$c_dlvtm\',\'$c_clean\',\'$c_sti\',\'$c_atte nded\',\'$c_d=
rvnbr\',\'$c_drv_flag\',\'$c_ldnbr\',\'$c_callnbr\',\'$c_cal _flag\',\'$c_=
channel\',\'$c_unq_id\',\'$c_cal_id\',\'$c_comment\',\'$full _shpdt\')");

this statement in my AGI is generating these errors/warnings=20
plz sort out

Use of uninitialized value in concatenation (.) or string at =
/var/lib/asterisk/agi-bin/acassens.agi line 503, line 14.
Use of uninitialized value in concatenation (.) or string at =
/var/lib/asterisk/agi-bin/acassens.agi line 503, line 14.
Use of uninitialized value in concatenation (.) or string at =
/var/lib/asterisk/agi-bin/acassens.agi line 503, line 14.
Use of uninitialized value in concatenation (.) or string at =
/var/lib/asterisk/agi-bin/acassens.agi line 503, line 14.
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