Catchable fatal error: Object of class stdClass could not be converted to string

[Max Thayer <mthayer@xxxxxxxxxxxxxxx>]

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Catchable fatal error: Object of class stdClass could not  be
converted to string in <filename> on line <line>
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I can only find the change log for PHP 5.2 identifying this type of
error, nothing on how to fix it.  I have updated PHP to 5.2.3 on
Apache 2.2.x on a BSD Box 6.x  If some one could explain to me what I
am doing wrong, and what I need to do to fix it that would be swell.
A point of note is that my $dbh is being created in my class
constructor as a private.  The method that is calling the prepare and
execute statements is a public.  I don't thing I'm trying to do
anything new or exotic, I don't think I'm trying to convert the object
to a string, just execute the query statement....

                        $begin = $this->dbh->beginTransaction();
                        if (!$begin) throw new HWIException(ERR0023,23);

                        $outdc = "";
                        $outliid = "";
                        $prep_users = $this->dbh->prepare($sql_users);
                        if (!$prep_users) {
                                $msg = $this->dbh->errorInfo();
                                throw new HWIException(ERR0021 . " " .
$msg[2], 21);
                        }

                        $prep_users->bindParam(':username',
$this->userObj->hwi_username,
PDO::PARAM_STR, 16);
                        $prep_users->bindParam(':title',
$this->userObj->hwi_title,
PDO::PARAM_STR, 4);
                        $prep_users->bindParam(':firstname',
$this->userObj->hwi_firstname,
PDO::PARAM_STR, 30);
                        $prep_users->bindParam(':midinit',
$this->userObj->hwi_midinit,
PDO::PARAM_STR, 1);
                        $prep_users->bindParam(':lastname',
$this->userObj->hwi_lastname,
PDO::PARAM_STR, 45);
                        $prep_users->bindParam(':priphone',
$this->userObj->hwi_priphone,
PDO::PARAM_STR, 30);
                        $prep_users->bindParam(':priext',
$this->userObj->hwi_priext,
PDO::PARAM_STR, 10);
                        $prep_users->bindParam(':secphone',
$this->userObj->hwi_secphone,
PDO::PARAM_STR, 30);
                        $prep_users->bindParam(':secext',
$this->userObj->hwi_secext,
PDO::PARAM_STR, 10);
                        $prep_users->bindParam(':fax',
$this->userObj->hwi_fax,
PDO::PARAM_STR, 30);
                        $prep_users->bindParam(':isPI',
$this->userObj->hwi_ispi,
PDO::PARAM_INT);
                        $prep_users->bindParam(':date_returned', $outdc,
PDO::PARAM_STR);
                        $prep_users->bindParam(':liid', $outliid,
PDO::PARAM_STR);
#####################   PROBLEM LINE OF CODE ###################
                        $exec = $prep_users->execute();
#################################################################

                        if(!$exec) {
                                $msg = $prep_users->errorInfo();
                                throw new HWIException(ERR0022 . " " .
$msg[2], 22);
                        }

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