I try to install WordPress on my add-on Domain.

4 add-on domains successfully installed, but I got error message for other 2 add-on domains:

“Install WordPress (2/3)
The installation can not be completed:
- You cannot install more than one script in the root directory of a domain.
Click on the browser's Back button to fix reported errors.”

I did not install any WP for my root directory.

Appreciate some one can help.