# 0043: Invalid array index

The [array](https://docs.sannybuilder.com/language/data-types/arrays#general-syntax) element index is not a [variable](https://docs.sannybuilder.com/language/data-types/variables).

**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
```