cannot add smooth line

I would like to add a smooth line through a scatter plot, so far I’m aiming at two solutions:

(ggplot(A_phsA, aes('timestamp', 'A_phsA'))
    + geom_point(color = 'blue')
    + xlab("2018 - 2019")
    + ylab("Phase current A [A]")
    + scale_x_datetime(breaks=date_breaks('1 month'), labels=date_format('%m %Y'))
    + geom_line(stat="smooth", method="loess", alpha=0.7)
    + theme(figure_size=(11, 6), axis_text_x=element_text(rotation=45))
)

(ggplot(A_phsA)
    + aes('timestamp', 'A_phsA') 
    + geom_point(color = 'blue')
    + xlab("2018 - 2019")
    + ylab("Phase current A [A]")
    + scale_x_datetime(breaks=date_breaks('1 month'), labels=date_format('%m %Y'))
    + geom_smooth(alpha = 0.1)
    + theme(figure_size=(11, 6), axis_text_x=element_text(rotation=45))
)

but none is working. What am I doing wrong?

[has2k1]

@jtrakk , I was mistaken, this is not a bug. The issue is the date column is a string. It needs to be the correct type.

data = pd.DataFrame({
    'date': pd.to_datetime(['1990-01-01', '1995-01-01', '2000-01-01']),
    'num': [1, 2, 5]
})

[jtrakk]

I see. In that case it would be nice to have a helpful exception message instead of silent failure.