lesson 3 error message

[billkerr1947]

Lesson 3 Raspberry Pi option
When I run /home/pi/nightlight/app.py I get this message
Check whether I2C enabled and Grove Base Hat RPi … inserted

Checked whether I2C was enabled. It was. I posted earlier about this.
Checked code several times, can’t see any errors, including a check against the code in the code-sensor/pi folder

Checked light sensor installation
Connected to A0 and only clips in one way

Took off and reinstalled Base HAT
Rebooted and the same error message occurred

I looked ahead in the course to see if I could check the Grove board is working in some other way but it all seems to build from this starting point