Solved - lcd.xxx() don't work

[Peter]

I have accessed the M5Stick C Plus display in Micropyton with lcd.print() in the past. Suddenly this does not work anymore.
from m5stack import *
from m5ui import *
from uiflow import *
lcd.clear()
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
NameError: name 'lcd' isn't defined
Can someone explain me how to use the internal M5Stack Micropython commands again.
As IDE I use Thonny.

After a restart of Thonny, it works again.