Error in MicroPython example

[CH3COOOH]

I copied the three .py files into my m5stack and reboot the device. It seemed that there was something wrong in "m5bala.py", line 141, which was lack of parameter. I fixed it, but then I faced the problem that I could not solve. It was shown in the PuTTY:
...
File "m5bala.py", line 85, in read_encoder
OSError: I2C bus error (263)
And once I changed the firmware from M5Cloud to M5GO and repeated the former steps, new error occurred:
...
File "m5bala.py", line 26, in init
OSError: I2C bus already used

[sancotec]

I have the same problem using M5Flow and trying to move Bala.
Any idea???? This is the python code generated by M5Flow
.....
from m5stack import *
from m5ui import *
from m5bala import M5Bala
import i2c_bus
clear_bg(0x111111)

rgb = RGB_Bar()
m5bala = M5Bala(i2c_bus.get(i2c_bus.M_BUS))
........

[sio-funmatsu]

@SiOnOu @sancotec

Sorry for my late reply...
Please try to reset M5Stack or M5Go.

[key]

I have same issue too. Does anyone solved this?
@sio-funmatsu I tried restart, but not working correctly...

[taxpon]

Same here