[imp] Strange config error

[cyx]

Hi
I am running all the newest horde/imp/dimp/.../gollem versions.
Since the last update I get the following error when I click on the  
horde symbol under the Administration-menu (to configure it):
Fatal error: Cannot redeclare class Horde_Block_gollem_tree_menu in  
/usr/local/www/horde/gollem/lib/Block/tree_menu.php on line 50
What have I done wrong?
Thx
Werner
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