Fatal errors requiring user.admin.inc admin/people/people

Thanks for reporting this bug. I've committed a fix for it. It works in my testing, but I'd appreciate it if you would also test it and report your findings. To test:

1. Install the 7.x-1.x-dev release of May 26 or later (I just committed the fix, so it will take 12 hours or so to show up in the next -dev release), or, if you prefer, apply the patch.
2. Clear your site's cache ("Clear all caches" at admin/config/development/performance).
3. Go to admin/people/people or admin/people/create.

Without the patch, either of those two paths will give the error message that you found. With the patch, they should both work.(admin/people/people seems to be the same as admin/people, so I'm not sure why it's there, but Language Assignment still shouldn't break it.) Please let me know.

This error doesn't occur in D6.

Fixed in 7.x-1.2. Please reopen this bug if you think otherwise.

I was wrong in #1. This error did occur in D6, when the user tried to visit admin/user/user/list or admin/user/user/create. Shame on me for not spotting that.

I've committed a fix and released it in version 6.x-1.5.

I am still getting this error when trying to open the permissions page.

Fatal error: require_once(): Failed opening required 'iptp/sites/all/modules/modified/languageassign/user.admin.inc' (include_path='.;C:\seu\xampp\php\PEAR') in C:\seu\xampp\htdocs\iptp\includes\menu.inc on line 515

Any idea how to fix that?

What i dont get is, that the error only occures on the page
admin/people/permissions

But when i uncomment the function:

function languageassign_menu_alter(&$items) {
  foreach (array('admin/people', 'admin/people/create', 'admin/people/people') as $key) {
    $items[$key]['page callback'] = 'languageassign_user_admin';
    $items[$key]['file'] = 'languageassign.admin.inc';
    $items[$key]['file path'] = drupal_get_path('module', 'languageassign');
    dpm($items);
  }
}

the error is gone. The point I dont get is, that admin/people/permission even is effected.

Found out that just a little "/" was missing there ;-)