Errors with IMP 2.3.6

[brooks roy]

I get these errors after installing imp 2.3.6



Warning: Constant no_action already defined in
/usr/local/horde-beta/imp/lib/IMP.php on line 10

Warning: Constant update_prefs already defined in
/usr/local/horde-beta/imp/lib/IMP.php on line 28

Fatal error: Undefined class name 'lang' in
/usr/local/horde-beta/imp/lib/base.php on line 38



Any ideas how i can fix?