[O] Logging of work no longer working with emcas24

[Im Exil]

Hi,

after I've decided to use emacs24 I found out that logging of work
does no lpnge work. All I get after typing:  "C-c C-x C-i" all I get
is an empty

CLOCK:

and the message:
byte-code: Symbol's function definition is void: org-get-effort

Any idea what I'm missing? I'm using the git version tag release_7.9.3
as ELPA did not really work well.

Thanks,
Dietmar