I am using SPARCC and I am used to downloading the network graph.
I notice that lately the “Network (PNG)” is working, while the “Network (SVG)” is not!
Every time I get " This page contains the following errors:

error on line 3 at column 43531: Unescaped ‘<’ not allowed in attribute values.

Below is a rendering of the page up to the first error."

Only lines and no circles.

Is it possible to correct it?

Please follow the post guidelines.. A minimal reproducible example is required or we will have no clue

Dear Jeff,
I solved the problem.
I was related to the metafile, which contained in the “Class” description some character (<) not allowed in your script.
Roberto Biassoni