To upload the svg, rename it from .svg to .fzpz and upload it as an fzpz and tell us it is really an svg.The forum sometimes has trouble rendering the svgs. The best thing would be to upload the entire part as a .fzpz file though, as then we have all the files that make up the part (4 svgs and the fzp). To do that right click on the part in its bin and click export part which will write an fzpz file that you can then upload. However I can answer your question just from the xml editor lines. This is an old part, in an old format. The copper0 isn’t needed any more. If you delete nonconn2 and nonconn3 and the copper0 group that should work fine (you probably need to also remove the copper0 definitions from the fzp file as well though). From the looks of the image in the svg you may also have translates usually caused by moving elements in a group without ungrouping it (which usually removes the translates). Sometimes that causes problems in gerber generation although in this case it looks to have happened in Inkscape as well.
Edit: I grabbed the part you started from and converted it to current norms (rescaled schematic and pcb, removed copper0 from pcb). The fzp file had in fact been correctly converted so just deleting copper0 in the pcb svg should work fine for you if thats what you choose to do.
AUDIO-JACK2_converted.fzpz (5.9 KB)