I'm not sure, but you may have copied the files that were supposed to be copied to the /Arcade directory to the /Admincp directory - you might want to double check where the files you uploaded got copied to... This is from the installation document:
Quote:
- The entire /arcade folder to your forum's root directory
- The files in the /admincp folder to your forum's /admincp folder
- The files in /includes/xml folder to your forum's /includes/xml folder
- arcade.php to your fourm's root folder
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That's the only thing I can think of that would cause this.