No contour lines.

[thedarkb]

Hi, I'm trying to host my own OpenTopoMap tile server, but I can't seem to get contour lines to work. Hillshading is working perfectly and the contours look correct in the database, but they are not being rendered. Renderd is displaying the following error messages:

Mapnik LOG> 2024-02-05 23:56:46: SVG PARSING ERROR:"SVG support error: <clip-rule> attribute is not supported"
Mapnik LOG> 2024-02-05 23:56:46: SVG PARSING ERROR:"SVG support error: <overflow> attribute is not supported"
Mapnik LOG> 2024-02-05 23:56:46: SVG PARSING ERROR:"SVG support error: <color-interpolation> attribute is not supported"
Mapnik LOG> 2024-02-05 23:56:46: SVG PARSING ERROR:"SVG support error: <color-interpolation-filters> attribute is not supported"
Mapnik LOG> 2024-02-05 23:56:46: SVG PARSING ERROR:"SVG support error: <color-rendering> attribute is not supported"
Mapnik LOG> 2024-02-05 23:56:46: SVG PARSING ERROR:"SVG support error: <image-rendering> attribute is not supported"
Mapnik LOG> 2024-02-05 23:56:46: SVG PARSING ERROR:"SVG support error: <shape-rendering> attribute is not supported"
Mapnik LOG> 2024-02-05 23:56:46: SVG PARSING ERROR:"SVG support error: <text-rendering> attribute is not supported"
Mapnik LOG> 2024-02-05 23:56:46: SVG PARSING ERROR:"SVG support error: <enable-background> attribute is not supported"

I have attached the current output below.