cPanel API 2 MysqlFE::createdbuser does not work for WHM version 11.48.0

Hello,
I have been using MysqlFE::createdbuser for creating mysql db user for a given database. I was working fine for WHM version < 11.48. But after upgraded into WHM 11.48, this api fails.

PHP Code I used.
$mysql_user = "dmspqrs";
$mysql_pass = "pqrs1234";
require_once("/usr/local/cpanel/php/cpanel.php");
$live = new CPANEL();
$result = $live->api2('MysqlFE', 'createdbuser', array('dbuser' => $mysql_user, 'password' => $mysql_pass));

Result was

Array
(
[cpanelresult] => Array
(
[postevent] => Array
(
[result] => 1
)

[data] => Array
(
)

[event] => Array
(
[result] => 1
)

[apiversion] => 2
[preevent] => Array
(
[result] => 1
)

[error] => 1
[func] => createdbuser
[module] => MysqlFE
)

)

I tried with dbuser={cpanel-user}_pqrs
but received same response with nor reason for error.
Please let me know why this happens with WHM version 11.48.0.
Thanks

- Chamith