EEPROM readReg function unknown error

readReg() function showing unknown error.

Here i am using AT24C256 EEPROM with I2C_1

code:

import mraa as m

import time

x = m.I2c(1)

while(1):

x.address(0xA0)

x.writeReg(0x0000,0x55) # also tried x.writeReg(0x00,0x55)

time.sleep(5)

x.address(0xA0)

if x.readReg(0x0000)== 0x55: # x.readReg(0x00)

print("EEPROM OK")

else:

print("EEPROM NOT OK")

Error:

root@rb-imx6ul:~/programs# vi EEPROM.py

root@rb-imx6ul:~/programs# python3 EEPROM.py

Traceback (most recent call last):

File "EEPROM.py", line 14, in <module>

if x.readReg(0x0000)== 0x55:

File "/usr/lib/python3.5/site-packages/mraa.py", line 549, in readReg

return _mraa.I2c_readReg(self, reg)

ValueError: Unknown error in I2c::readReg()