![factorio tutorial factorio tutorial](https://i.pinimg.com/originals/5f/de/11/5fde11b3186be1f5f475f0544e7c53d6.gif)
This is a Lua error that means the mod is trying to access a value that doesn't exist. So if your mod is titled "myMod" version 0.0.1, in order for Factorio to read it, the folder must be titled "myMod_0.0.1". The folder name of your mod must include the version number, and name of the mod separated by an underscore. "C:\Factorio\mod doesn't match the expected mod_version# (case sensitive!)" Try to check for common errors like missing a comma while defining an array or writing data.extend instead of data:extend beforehand. If a line is specified, then the odds are high that the mistake actually happened on one of the previous lines. General note: Errors give you either a line info or at least a reference as to where the error occurred. 3.6 How do I submit my mod to the mod portal?.3.4 How do I declare a dependency of my mod?.3.3 How can I disable a recipe with scripting?.3.2 How do I make an entity store/consume energy even if it wasn't made to?.3.1 How do I store information with an entity, like integers or booleans?.2.3 I'm trying to change the attributes of a vanilla entity, but it's not working!.2.2 The name of my item is displayed as "Unknown key: item-name.yourname".2.1 My item / entity wont load the sprite I made.1.3 Failed to load mods: Error while loading prototype "prototype-name" (prototype-type): Key "property-name" not found in property tree at -name.1.1 "C:\Factorio\mod doesn't match the expected mod_version# (case sensitive!)".