This means one or more of your scalars in line 98 have a undef value. check:

$error_msg_x
$error_msg_xx
$error_msg_pw_x
$error_msg_pw_xxx
$error_msg_pw_xx
$error_msg_city
$error_msg_state
$error_msg_date
$error_msg_zip
$error_msg_email
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