I get this error when running the screenbacktest_advanced.py example.
Any clues? All other examples run fine.
Screenbacktest_advanced.py ran for me with no errors. The the first thing to try would be to run an update to make sure you have the latest build. I dont know where you are running it from, but if your using an IDE like PyCharm, etc, then go to a DOS prompt and run this: pip install --upgrade p123api
Then try to run the example again.