# AUR4001

## Error Message

`AUR4001: Translation parameter already existed`

## Description

This error occurs when attempting to register a translation parameter that has already been registered. The i18n system doesn't allow duplicate parameter registrations to prevent conflicts.

## Solution

Check for existing parameters before registering new ones, or use a different parameter name.

```typescript
// ✅ Use unique parameter names
i18n.registerTranslationParameter('param1', value1);
i18n.registerTranslationParameter('param2', value2); // Different name
```


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://docs.aurelia.io/developer-guides/error-messages/4000-to-4002/aur4001.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.