[horde] problems after cvs update "Undefined index: cache_folders"

[Michael Riehemann]

hi together,
today in the morning i do "cvs update"
in my great working horde Head install.
after I get all the new stuff from *.dist
I get only empty pages. The log file dont 
record any problems.
Only Imp say after login,:

Notice: Undefined index: cache_folders in
/srv/www/htdocs/horde/imp/lib/IMP.php on line 620

Notice: Undefined index: cache_folders in
/srv/www/htdocs/horde/imp/lib/Folder.php on line 141

Notice: Undefined index: cache_folders in
/srv/www/htdocs/horde/imp/lib/Folder.php on line 262

Notice: Undefined index: cache_folders in
/srv/www/htdocs/horde/imp/lib/IMP.php on line 680

Notice: Undefined index: cache_folders in
/srv/www/htdocs/horde/imp/lib/IMP.php on line 620

Notice: Undefined index: cache_folders in
/srv/www/htdocs/horde/imp/lib/Folder.php on line 141

Notice: Undefined index: cache_folders in
/srv/www/htdocs/horde/imp/lib/Folder.php on line 262

Notice: Undefined index: cache_folders in
/srv/www/htdocs/horde/imp/lib/IMP.php on line 

any ideas??

thanks for any help.