thanks iionly,

but also with that file, i can't access to admin pages, settings, setting tool

error debug doesn't give me errors.

all functions and pages connected with an admin gives a white page. Can be something wrong with elgg_token ? but alos if i disable admin_gatekeeper(); no access to admin pages

also if i delete mod/ folder same problems

I'm still understanding this problem, any idea? there are a lot of not defined in the system:

The requested action (widgets/reorder) was not defined in the system.
The requested action (logout) was not defined in the system.
The requested action (friends/addcollection) was not defined in the system.
The requested action (friends/remove) was not defined in the system.

if I try to delete a message I have a page not found with this link:
http://site.com/mod/messages/inbox/myname?offset=
then if I return back with browser, I have message successfully removed

do one more thing go to phpmyadmin and elgg_metastings>>try to find an entry like enabled_plugins in that if you find that just delete that entry and after that your problem will fix:-

Note:-- please take a database backup before doing this.

deleting it , nothing change and plus I can't access on site:

The requested action (login) was not defined in the system.

The problem seems to be in database also if url path are correct and elgg can read db.

With plugin disabled still I have functions not define in the system and no access in admin pages and also in user settings pages

@lord55, can you check the .htaccess file and the permissions of your data directory?

htaccess is original and permission is on 775, changed also to 777 , but nothing

the most strange thing is that I can't access in admin pages and I can't do any functions with admin.

disabling plugins then I can't access in site:

The requested action (login) was not defined in the system.

so seems that the problem is not in plugins but maybe in db, because I uploaded elgg file many times

@lord55 have a look at how my images problem was resloved, it might help you.

http://community.elgg.org/pg/forum/topic/684643/elgg-176-missing-images-and-user-profile-avatars/