ImageManager 2.5.2 installation error

here is my issue, I have installed imagemanager 2.5.2 and it doesn’t work. I have this message on my admin pages (I think this come from my provider but i don’t know how to change that :
Warning: main(/mnt/166/sda/1/a/frederick.monge//wp-content/plugins/ImageManager/resources/buttonsnap.php) [function.main]: failed to open stream: No such file or directory in /mnt/166/sda/1/a/frederick.monge/wp-content/plugins/ImageManager/imagemanager-plugin.php on line 822

Warning: main() [function.include]: Failed opening ‘/mnt/166/sda/1/a/frederick.monge//wp-content/plugins/ImageManager/resources/buttonsnap.php’ for inclusion (include_path=’/mnt/166/sda/1/a/frederick.monge/include:.:/usr/php4/lib/php’) in /mnt/166/sda/1/a/frederick.monge/wp-content/plugins/ImageManager/imagemanager-plugin.php on line 822