# Error in whitelisting addresses?
If you get an error thrown when trying to add more addresses, then you probably didnt check your addresses before adding them.
## How do I check my Addresses?
{% embed url="" %}
Basically all addresses should be valid Addresses, the best way to do this, is with an editor:
We will use these following tools to check our addresses:
*
*
### 1. Load the Addresses seperated by "NewLine" into a new File
### 2. Delete the duplicates:
### 3. Use the online tool to seperate the addresses by ","
### 4. Now it should work. If you still got errors, make sure to split up your addresses in smaller batches and check for the invalid address.
---
# 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.dexpad.io/faqs/create-your-presale-lock/presale-whitelist/error-in-whitelisting-addresses.md?ask=
```
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.