Old save won't load

[Quantum1000]

I have a save that I started in the 1.1.110-0 version of factorio, using the Space Exploration mod, among others, that I used to do combinator development. When Space Age came out, I converted it to the new version, and let factorio delete all of the modded items, I only needed to keep the combinators. I was last able to successfully load it and save it again on the 2.0.55-0 version. I wanted to play with it again on the latest version, 2.0.72, but it wouldn't load, giving the error:
An error occured while compiling "entity:big-sand-rock:probability" noise expression:
MultioctaveNoise::offset_x can't be infinite
Attempting to load it in 2.0.60 didn't work, either, with the same error. All of the autosaves have the same problem.
Attached are the log and the save file.

[jodokus31]

Not really an idea...sounds like something from the mods is sticking in the save.

Maybe it helps, when you install the recent space exploration mods again? it should be available now in 2.0

Or you could try to use the 1.1.110 save directly, or is this already outdated?

[eugenekay]

The sand-big-rock entity comes from the Alien Biomes mod; the definition for which looks like this:

Code: Select all

{
  name = "sand-big-rock",
  type = "simple-entity",
  flags = {"placeable-neutral", "placeable-off-grid", "not-on-map"},
  icon = "__base__/graphics/icons/big-rock.png",
  icon_size = 64,
  subgroup = "wrecks",
  order = "b[decorative]-l[rock]-b[big]",
  collision_box = {{-0.75, -0.75}, {0.75, 0.75}},
  selection_box = {{-1.0, -1.0}, {1.0, 0.75}},
  render_layer = "object",
  max_health = 500,
  autoplace = {
    order = "a[doodad]-a[rock]-b[big]",
    probability_expression = "max_probability * sharpness_filter",
    local_expressions = {
      max_probability = 0.175 * rock_max_prob_multiplier,
      sharpness_filter = "ab_sharpness_function(peaks_expr, 0.7)",
      sharpness = 0.7,
      peaks_expr = "influence_modifier + peak1_expr",
      peak1_expr = "peak1_noise_expression",
      peak1_noise_expression = "multioctave_noise{x=x, y=y, persistence=0.9, seed0=map_seed, seed1='rocks', octaves=octaves-2, input_scale=1, output_scale=1}",
      octaves = "8 - log2(var('control:rocks:frequency'))",
      influence_modifier = "0.5 - quantile",
      quantile = 1.9,
    },

Note the usage of a probability_expression in the prototype.... I can only guess as to why having this expression missing results in a Game load Error - this is possibly a Bug? In any case, re-installing the Mod allows the Savegame to be loaded in Version 2.0.72:

11-04-2025, 18-42-11.png (2.42 MiB) Viewed 169 times

I would recommend taking a Blueprint of anything interesting from the Save, and starting-over with a new game.

Good Luck!

[Quantum1000]

Solved! Installing alien biomes mod allowed me to open the save, and I've now moved everything over to a new save via blueprint. Thanks guys.