LUA: Bad Argument

[dingbat91]

Hey there everyone nice to meet you!

I'm trying to make a small mod for friends and myself which adds a new inserter, it's been going well, but when I try and run the game with my mod I get the following:

Code: Select all

<mod folder>|data.lua:2:L:/factorio\data\core|lualib|dataloader.lua:10: bad argument #1 to 'ipairs' (table expected, got nil)

anybody know what's going on, just trying to figure out where I've gone wrong so I can fix it.

thanks for your help
-
Dingbat

[kovarex]

Hello, we will gladly help you, but you should provide the code you use in the mod. (Or you can just upload the work in progress mod)

[FreeER]

You pretty much have to read the error message backwards , it's saying that there was a problem with calling the function ipairs on line 10 of the dataloader.lua file, because it was expecting to receive a table (that is data inside of these: '{}') as it's input.

Considering the error is in the dataloader file (a file that is never modified by modders because it takes the prototypes that a mod creates and places them the data.raw table which is then loaded into Factorio) I'd guess that one of your prototype files is not in this format

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data:extend( --start of data:extend function call
{ --start of data:extend table
  { -- first entry
    type="whatever"
    --type specific information for this entry
  }, -- end of first entry

  -- other entries

  { -- last entry
    type="whatever"
    --type specific information for this entry
  } -- end of last entry
} -- end of data.extend table
) -- end of data:extend function call.

but I can't be sure without actually seeing what you have. If that wasn't enough information to help you solve the issue I would highly suggest that you upload the mod as an attachment with your next post here so we can see it ourselves

[dingbat91]

Sure!

it's just an addition of a long arm smart inserter as requested by a friend.

Here is a rar containing the in-progress mod!

Thanks again!

[dingbat91]

I was really careful to make sure they were in that format, and I double checked.
the only one that isn't in a data:extend() table is my technology as that is just a modification to a base tech (Electronics) so I just call data.raw["technology"]["electronics"].effects =<blah>

You pretty much have to read the error message backwards , it's saying that there was a problem with calling the function ipairs on line 10 of the dataloader.lua file, because it was expecting to receive a table (that is data inside of these: '{}') as it's input.

Considering the error is in the dataloader file (a file that is never modified by modders because it takes the prototypes that a mod creates and places them the data.raw table which is then loaded into Factorio) I'd guess that one of your prototype files is not in this format

Code: Select all

data:extend( --start of data:extend function call
{ --start of data:extend table
  { -- first entry
    type="whatever"
    --type specific information for this entry
  }, -- end of first entry

  -- other entries

  { -- last entry
    type="whatever"
    --type specific information for this entry
  } -- end of last entry
} -- end of data.extend table
) -- end of data:extend function call.

but I can't be sure without actually seeing what you have. If that wasn't enough information to help you solve the issue I would highly suggest that you upload the mod as an attachment with your next post here so we can see it ourselves

[FreeER]

ah. Found it. Within your items.lua file you call data.extend instead of data:extend. One tiny little error really easy to miss (that's why I copy/paste a lot lol)
Also, within the entities file the icon (right underneath the name) is "smart-inserter.png" instead of "long-smart-inserter.png" (so Factorio gives an error of "Sprite outside of "__SmartArm__/graphics/icons/smart-inserter.png" (at 32, 32, size of 0x0 of 0x0).")

[dingbat91]

ugh, I can't believe I missed that. darned eyes! thanks!

thanks for noting the icon issue as well!

[FreeER]

Happy to help, and I only spotted it because I was expecting an issue with the data formatting and didn't see one

[slay_mithos]

I was really careful to make sure they were in that format, and I double checked.
the only one that isn't in a data:extend() table is my technology as that is just a modification to a base tech (Electronics) so I just call data.raw["technology"]["electronics"].effects =<blah>

Oh, that is a newbie error too, your new effect should be inserted by

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table.insert(data.raw["technology"]["electronics"].effects, {type = "unlock-recipe",recipe = "long-smart-inserter",})

That way, you won't clash with other mods or future updates that would add other effects to that tech.

[dingbat91]

thanks!