g400 Encode pdu error

Good write next so I have the sample script of chan-extra to send sms in a masica but when I run it gives error pdu'm using asterisk-11.4.0 dahdi-2.6.1 and attached the script I'm using and the error giving

script sms.sh

#!/bin/sh
context=`cat ./mensajes.txt`
cat ./telefonos.txt | while read row;
do
asterisk -rx "gsm send sms 4 $row \"$context\""
done;

The error I get when I run the script is as follows

Encode pdu error
"hello world"' failed.
Encode pdu error
"hello world"' failed.
Encode pdu error
"hello world"' failed.
Encode pdu error
"hello world"' failed.

Pls attach the mensajes.txt file.