some command are not working.

[JadooChoi312]

ip_address:/> display "Hello World!"
Setting printer's display message to "Hello World!"
ip_address:/> info status
CODE=10001
DISPLAY="Non HP supply in use"
ONLINE=TRUE
74.225.233.154:/>

and also

when i do print, the output only show H,

and also

ip_address:/> print
File or "text": "Hello World!"
Converting 'Hello World!' to pcl format
Cannot convert (b"convert-im6.q16: unable to open image Hello World!': No such file or directory @ error/blob.c/OpenBlob/2967.\nconvert-im6.q16: no decode delegate for this image format ' @ error/constitute.c/ReadImage/581.\nconvert-im6.q16: no images defined `pcl:-' @ error/convert.c/ConvertImageCommand/3234.\n")
Traceback (most recent call last):
File "/home/kali/PRET/printer.py", line 138, in onecmd
cmd.Cmd.onecmd(self, line)
File "/usr/local/lib/python3.10/cmd.py", line 217, in onecmd
return func(arg)
File "/home/kali/PRET/printer.py", line 817, in do_print
data = c.UEL.encode() + data + c.UEL.encode()
TypeError: can't concat NoneType to bytes
None
Program Error (can't concat NoneType to bytes)
ip_address:/>

i wish u can fix the problem..