Duplicate add-on ID found error meassage when submitting ad-on for the first time

Add-ons
#1

Hi there,

When I submit my extension for the first time i receive the following error : Duplicate Add-on ID found.

Can someone tell me what this error message means and where I can update the add-on ID?

Thanks,
Haspit

#2

The add-on ID is probably set in the manifest.json:

If you’ve based your extension on an example or another extension, this is likely already set.