<!-- 0Gkit docs — CONFIG_INVALID_ADDRESS
     Source: https://docs.0gkit.com/errors/CONFIG_INVALID_ADDRESS
     LLM-friendly Markdown twin of the page. -->

# CONFIG_INVALID_ADDRESS

**Not a valid 0x address**

## What happened

An address argument did not match the `0x` + 40 hex chars format (EIP-55 mixed-case is also accepted).

## How to fix

Double-check the address — common mistakes are missing the `0x` prefix or copying a contract name instead of the address. Use `viem.getAddress(...)` to normalize if needed.

## Example

```ts
import { getAddress } from "viem";
const normalized = getAddress("0xAbC...");
```

## Reference

- Namespace: `CONFIG`
- Help URL: `https://0gkit.com/errors/CONFIG_INVALID_ADDRESS`
- See also: [all error codes](/errors)