codignaiter project error on live server

Not quite. It is saying that PHP is configured to load the suhosin extension, but couldn't find it at the specified location.
That doesn't necessarily mean that it is not installed (though it is likely).

Good point. So to summarize: Suhosin is failing to load due to one of the following

1. It is not installed
   
2. It is installed, but the required extension (*.so) files are not at the location indicated in php.ini