Persee SimpleRead - no devices found

Hi,
My Persee is running ubuntu 14.04 OS.
I can run SimpleRead before, but today it shows “Couldn’t open device\n DeviceOpen using default: no devices found”.

when I execute ‘lsusb’, it shows as below:
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

Anyone can help?
BTW, how to reinstall Persee with ubuntu 14?