errors when sending sms (in arabic)

[lagrandeours]

i had this matter :

[19-Apr-2012 10:19:11] message 31111_0026_906231946 status: failed
[19-Apr-2012 10:21:05] message 31111_0026_906231946 status: sent
[19-Apr-2012 10:21:05] PHP Warning: unlink(EnvayaSMS3/server/php/example/outgoing_sms/31111/31111_0026_906231946.json): No such file or directory in EnvayaSMS3/server/php/example/www/index.php on line 378

now i reduced the number of sms sent to 10 by minute that solved this matter,

if you had same matter can you share your experience.