Missing savefile options
Which freeciv version? Can you attach the savegame you are trying to load?
The error seems to come from the ruleset, though, not directly from the savegame itself.
I suspect there has been two parallel freeciv installations set up badly, i.e., one version trying to read ruleset of the other. That often leads to errors like the reported one.
Missing savefile options. Can not load the savegame. in send_ruleset_game() [../../../../server/ruleset.c::6871]: assertion 'game.veteran != ((void *)0)' failed. SVP, rapportez ce bogue à https://osdn.net/projects/freeciv/ticket/ xxxx: 'take -' /take: Il n'y a pas de joueur libre pour xxxx. Received packet PACKET_PLAYER_READY(11) from non-player connection xxxx de DESKTOP-96PFN29.