I received this error when trying to install the plugin - FTP credentials don't allow to write to file /.htaccess.
I called support at BlueHost - they worked with me for about 30 minutes but they do not know how to fix this. They say this plugin wants to write to root folder of server "/". I am on a hosted server and I have this website as an add-on domain ( sub folder of public_html ).
I hear this plugin is great - hope I can get it working although proper configuration looks a bit daunting.