What does this error mean: "WARN Infinite extent for field "rate": [Infinity, -Infinity] Fontconfig warning: "/etc/fonts/fonts.conf", line 86: unknown element "blank""?

Hi

This questions is related to this other one: https://discourse.julialang.org/t/how-to-make-vegalite-read-my-topojson-file/34546/12

The goal is to make a choropleth map.
I was succesful in reading a topojson file. Now I have to read a dataframe (df_splunk). This dataframe has many columns but “count” is the one to be used as it will give the intensity of color to the map.

This is my code:

@vlplot(width=800, height=600) +
@vlplot(
    mark={
        :geoshape
    },
    data={
        values=JSON.parsefile("/home/juliana/roc/Data/Topojson/disa_ONT_region.topojson"),
        format={
            typ=:topojson,
            feature=:disa_ONT_region
        }
    },
    transform=[{
        lookup=:featureId,
        from={
            data=df_splunk,
            key=:featureId,
            fields=["count"]
        }
    }],
        projection={
        typ=:albersUsa
    },
    color="rate:q"
)

The error that I am getting is the following:

WARN Infinite extent for field "rate": [Infinity, -Infinity]
Fontconfig warning: "/etc/fonts/fonts.conf", line 86: unknown element "blank"
WARN Infinite extent for field "rate": [Infinity, -Infinity]
Fontconfig warning: "/etc/fonts/fonts.conf", line 86: unknown element "blank"

I get the same error when I just want to make a barplot of the same dataframe:

df_splunk |> @vlplot(:bar, x=:count, y="featureId:o")

Even when using a very small dataframe (df_x). But at least here I can see the plot.

I get the same error. Has anybody a clue how to solve this?