check_error(result, context="client")

[Houman]

Hello,
I am going to read the DBarea from PLC S7 1200, for this goal I try to import some of the libraries in to the python but I could not solve this error. I am new in pythone. Can you help me

import snap7
from snap7.util import *
import struct
import snap7.client
from snap7.snap7types import S7AreaDB

plc=snap7.client.Client()

plc.connect('10.1.1.98',0,1)

area= 0x84
start=0
length=1
bit=0

byte= plc.read_area(area,0,start,length)

No handlers could be found for logger "snap7.common"
Traceback (most recent call last):
File "", line 1, in
File "/usr/local/lib/python2.7/dist-packages/snap7/client.py", line 242, in read_area
check_error(result, context="client")
File "/usr/local/lib/python2.7/dist-packages/snap7/common.py", line 69, in check_error
raise Snap7Exception(error)
snap7.snap7exceptions.Snap7Exception: CLI : function refused by CPU (Unknown error)

[Remzi Can]

I have same problem.