Database: Newlestter

[cascadambs74]

I've tried setting up a newlstter on my site but is keeps coming back with:

Warning: is_file() [function.is-file]: open_basedir restriction in effect. File(/usr/lib/php/RVSeagullMod/lib/SGL/FrontController.php) is not within the allowed path(s): (/home/:/tmp) in /home/cascada/public_html/rvscommonfunc.php on line 53

Warning: is_file() [function.is-file]: open_basedir restriction in effect. File(/usr/local/lib/php/RVSeagullMod/lib/SGL/FrontController.php) is not within the allowed path(s): (/home/:/tmp) in /home/cascada/public_html/rvscommonfunc.php on line 53

Warning: require_once(/home/cascada/.rvsitebuilder/seagull/lib/SGL/FrontController.php) [function.require-once]: failed to open stream: No such file or directory in /home/cascada/public_html/rvscommonfunc.php on line 228

Fatal error: require_once() [function.require]: Failed opening required '/home/cascada/.rvsitebuilder/seagull/lib/SGL/FrontController.php' (include_path='.:/usr/lib/php:/usr/local/lib/php') in /home/cascada/public_html/rvscommonfunc.php on line 228

Please help!!!!!