Array Index Symptom 10

Article verified: January 2020

This is one cause of the Simulation error Array index is out of range error.

Symptom

You will see this error, or similar, on screen and in the log file:

• Simulation error: Array index is out of range.

In the log file search to find the error above. On the line after that error, you should see something starting with:

• at TerrainModify.ApplyQuad ...

or

• at TerrainModify.UpdateAreaImplementation ...

Cause

We suspect this is caused by the outdated and game-breaking mods, namely:

• Building Anarchy
  • Instead of Building Anarchy mod, you should use combination of both Ploppable RICO Revisited (activate relevant settings in RICO options before loading a save!) and Find It! mods. Alternatively Find It! in combination with Plop the Growables also works.
• Terraform Tool 0.9
  • Instead of Terraform Tool 0.9 mod, you should use either vanilla terraform tools (in the Landscaping menu in-game), or, optionlly, subscribe and enable the Extra Lanscaping Tools mod which adds a few extra features.
• Terrain Generator
  • Instead of Terrain Generator mod, use either vanilla terraform tools (in the Landscaping menu in-game), or, optionlly, subscribe and enable the Extra Lanscaping Tools mod to sculpt terrain in-game or map editor

Other possible causes (not verified but worth conisdering):

• It could also be due to one or more mods not being compatible with 81 Tiles mod. Many older mods assume that your whole city will be within the central 25 tiles.
• Old mods that alter zoning around roads -- see also: Array Index - Symptom 5

Solution

• Completely unsubscribe Building Anarchy, Terraform Tool and Terrain Generator mods
  • Don't just disable them; they need to be completely removed so unsubscribe them
• Exit game to desktop
• Relaunch game and see if the error has gone

There might be some left-over side-effects due to faulty terrain glitches or broken buildings on the map in your save game. If that is the case:

• If you haven't already done so, subscribe and enable Loading Screen Mod (LSM)
• In it's mod options, enable the Safe Mode options
• Load your save game
• Assuming it works:
  • Broken building shsould just automatically despawn
  • If there are terrain glitches, use "Smooth" or "Flatten Terrain" tool to fix (you can find those tools in the Landscaping menu in-game).
• Save the game under a new file name
• Exit to desktop, relaunch then load the new save file - should now hopefully work properly :)

Fixed?

If not, see other causes of Simulation error Array index is out of range.

Other issues? See: Troubleshooting