Glossary installation problems

Hello everyone i was installing the glossary plugin and it crahed my site this is the error it presented:

Warning: require_once(/home/gardalogia33/masonrynow.com/components/com_cobalt/library/php/helpers/helper.php): failed to open stream: No such file or directory in /home/gardalogia33/masonrynow.com/plugins/content/glossary/glossary.php on line 4

Fatal error: require_once(): Failed opening required '/home/gardalogia33/masonrynow.com/components/com_cobalt/library/php/helpers/helper.php' (include_path='.:/usr/local/lib/php:/usr/local/php5/lib/pear') in /home/gardalogia33/masonrynow.com/plugins/content/glossary/glossary.php on line

I managed to fix it by deleting the line 4 in glossary.php which helped me regain control of the admin panel.

Any ideas how to install your plug without this occuring?!

Thanks!