If you have problems with RaidPlanner, first try to install the latest version, maybe the bug is already fixed, and then check the followings. I your problem still exists after you have checked the things below, post your problem in GitHub issue tracker or RaidPlanner Bug reporting forum.
Joomla 1.5:
Check if Mootools Upgrade plugin is published. Go to Plugin Manager of Joomla, filter Mootools.
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