exception occurred: 'NoneType' object has no attribute 'text'

[Jesus-M]

Hi,

I'm trying to use this API and I am finding this problem:

I can find the printer in the network:

# hpscancli -s
Searching for printers. Please wait...
Scanning Network: [==================================================] 100.00%
Found 172.16.0.20
# 

But when I try to do anything else either the printer disappears or returns an exception:

# hpscancli -i 172.16.0.20 -c
Error. counldn't connect to the printer. please check the ip: 172.16.0.20
# hpscancli -i 172.16.0.20 -c

exception occurred: 'NoneType' object has no attribute 'text'
# hpscancli -i 172.16.0.20 --height 842 --width 595 --dpi 300 --colormode RGB24 --pdf -o scan1

exception occurred: 'NoneType' object has no attribute 'text'
#

Any idea? Maybe it requires authentication? (it does when I access the printer using its web interface)

The printer is a HP ENVY 4520 All-in-One Printer series