Easysendsms gateway - unicode SMS get error 1004: invalid message

Hi, Dear value community members

I’m using easysendsms gateway for outgoing sms
I use Playsms from Compose message page to send unicode sms through easysendsms gateway.
I got the error 1004: invalid message from easysendsms gateway.

Find bellow all necessary details

Thank a lot for your so important assistance.

Best regards.

take a look at this code in fn.php:

try to use the previous line instead, to use UCS-2BE, comment the current line