> 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/0058.md).

# 0058: Invalid parameter

A [command](/language/instructions/built-in-commands.md) has been given an invalid parameter. For example, it may happen if a number is used in [`SQR`](/language/instructions/built-in-commands.md#sqr), while the compiler expects a [variable](/language/data-types/variables.md).

**Possible solutions:** check the command and use valid syntax:

```
sqr(10) // error, variable expected
sqr($var) // OK
```