I would like to create a time series chart that shows single lines for each feature in my feature collection “sites”.

Using ui.Chart.image.series for my feature collection “sites”, I managed to plot the time series from all points.

However, using ui.Chart.image.seriesByRegion (hoping that this produces a line for each feature in my time series chart) produces two errors “Invalid argument specified for ee.Number(): timeFormat” and “Invalid argument specified for ee.Number(): year”

I thought it was maybe a problem with my original feature collection and also imported some points fo interest seperately and created a neew feature collection “points”. However, it produces the same error messages, so the error must be caused by a different problem.

Here is my script