Failed to convert to axis units

I'm getting the following error when running the example code, specifically the backtest plot.
`ConversionError: Failed to convert value(s) to axis units: (NaT, Timestamp('2023-03-29 00:00:00+0000', tz='UTC'))`

The comment inside the your code says something about having to set the starting date on Monday, but I'm getting this error even after setting the starting date to Monday (June 6th, 2022, May 2nd 2022, etc.)