> 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/0019.md).

# 0019: Unknown array type

You did not specify the array [type](/language/data-types/arrays.md#array-declaration), or provided an invalid value (for example, a number).

**Possible solutions:** use a valid type name:

```pascal
var
    $var: array 10 of Double // incorrect
    $var: array 10 of Float // correct
end
```