LinuxQuestions.org - trying to connect usb device to buntu12.04

Hi everybody;

i'm trying to connect esb device called paparazzi and the program of it can't see it

and i had the following error
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but the following error appeared to me in program connect with it.

Failure("Error opening modem serial device : fd < 0 (/dev/ttyUSB0)")
Broadcasting on network 127.255.255.255, port 2010

FAILED '/home/marathon/paparazzi/sw/ground_segment/tmtc/link' with code 1

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and i tried the following code in the terminal

ls /dev/ttyUSB*

but the following message appeared

ls: cannot access /dev/ttyUSB*: No such file or directory

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and i tried the following code

dmesg | grep tty

but the following message appeared

[ 0.000000] console [tty0] enabled
[ 2.062847] 00:09: ttyS0 at I/O 0x3f8 (irq = 4) is a 16550A
[ 2.093227] 00:0a: ttyS1 at I/O 0x2f8 (irq = 3) is a 16550A

Inline image 1

could you explain me what is the meaning of these errors
i guess that the virtual machine can't see the paparazzi

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but what made me confued that when i wrote the command

dmesg | tail

the following message appeared

[ 47.421477] ISO 9660 Extensions: Microsoft Joliet Level 1
[ 47.455032] ISOFS: changing to secondary root
[ 61.212473] show_signal_msg: 24 callbacks suppressed
[ 61.213273] pool[2749]: segfault at ab421000 ip b777b18e sp ab3e75bc error 6 in ld-2.15.so[b777a000+20000]
[ 327.538645] usb 2-2.1: new full-speed USB device number 4 using uhci_hcd
[ 327.816019] usb 2-2.1: New USB device found, idVendor=1d50, idProduct=600f
[ 327.816050] usb 2-2.1: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[ 327.816077] usb 2-2.1: Product: Lisa/M (Upgrade) V1.1
[ 327.816103] usb 2-2.1: Manufacturer: Transition Robotics Inc.
[ 327.816129] usb 2-2.1: SerialNumber: LM2-297 35FFD3053256383365422143\x04\x18

so the computer see it could anyone explain to me what is happened?

thanks