Problems moving website to new directory

[Sorcha]

Hi all,

I currently have my prestashop store in a subdirectory, http://tomsheehy.com/Prestashop. I want to move the store to http;//tomsheehy.com, the root directory. Have tried simply moving it, and it did not work. Have tried changing the directory in back office before I move but it won't let me. The following error is coming up. 

 

Before being able to use this tool, you need to:
- Create a blank .htaccess in your root directory.
- Give it write permissions (CHMOD 666 on Unix system)

 

I have created a blank htaccess in the root directory and added a blank robots file, with the correct permissions but its still not working. Could it be somehting to do with the version of Prestashop I am using? 1.5.6.0?

 

Any help appreciated.