> For the complete documentation index, see [llms.txt](https://docs.sannybuilder.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.sannybuilder.com/troubleshooting/errors/0043.md).

# 0043: Invalid array index

The [array](/language/data-types/arrays.md#general-syntax) element index is not a [variable](/language/data-types/variables.md).

**Possible solutions:** use a global or local variable:

```
$var(0,2i) = 1 // error

$index = 0
$var($index,2i) = 0 // OK

or

var
  $var: Array 2 of Integer
end
$var[0] = 0 // OK
```