Help Me !!!

> I'm having problem with the kannel, I sending messages and after a few
> it crash and i get these messages: 
> 
> 2002-02-17 19:40:59 [6] WARNING: emi2: required field MT missing
> 2002-02-17 19:40:59 [6] WARNING: Empty sender field in received message
> 2002-02-17 19:40:59 [6] PANIC: gwlib/octstr.c:2031: seems_valid_real: 
> Assertion `ostr != NULL' failed. (Called from
> gw/bb_smscconn.c:65:log_sms.)
> 
> it seems that it happen only when i send data message via mobile phone
> 
> can anyone help me 
> 
>