Serial port problem using Debian with chipsee LCD expansion

I’m using the debian image made for this LCD cape:

I’m using this image:

I’m trying to use different RS232 com ports:

If I try to use the /dev/ttyO1 (the D rs232 connectors labeled COM 1) I can’t communicate with my device using HamLib.

If I try to connect a FTDI USB RS232 cable, I can’t see the /dev/ttyUSB port…

If I type:

debian@beaglebone:~$ modprobe ftdi_sio

libkmod: ERROR …/libkmod/libkmod.c:505 kmod_lookup_alias_from_builtin_file: could not open builtin file ‘/lib/modules/3.8.13-00720-g4202df2-dirty/modules.builtin.bin’

FATAL: Module ftdi_sio not found.

can someone help me?