> For the complete documentation index, see [llms.txt](https://docs.dexpad.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.dexpad.io/faqs/create-your-presale-lock/presale-whitelist/error-in-whitelisting-addresses.md).

# 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="<https://web3-tools.netlify.app/>" %}

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:

* <https://notepad-plus-plus.org/downloads/>
* <https://delim.co/#>

### 1. Load the Addresses seperated by "NewLine" into a new File

![](/files/-MlKelWerUmaAzOTzwCT)

### 2. Delete the duplicates:

![](/files/-MlKf-UEmI_XvhFn7e7B)

### 3. Use the online tool to seperate the addresses by ","

![](/files/-MlKf6Nu3ic0d1Wp498i)

### 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.