Hello and welcome to Advanced Installer forums,
This error may occur if you are using a multilingual package with a display language selection dialog (for multi-language packages) in the
Languages Tab. This is a known issue that occurs when your different language installations have different
Product Codes.
In order to overcome this, you should use the same Product Code for all of your installation languages. Just, go to "Product Details page ->
Product IDs tab and set the same Product Code GUID for all of your installation languages.
Best regards,
Dan