I think this simple_access/inc/admin.inc file is missing from the current (6.x-2.0-rc1) stable release pack.
It was presented in beta7. After upgrade my site reported errors at page /admin/content/simple_access

include_once() [<a href='function.include'>function.include</a>]: Failed opening 'modules/simple_access/inc/admin.inc' for inclusion (include_path='.:/usr/share/php:/usr/share/pear') - /...../...mysite.../includes/theme.inc - line 593.

include_once(modules/simple_access/inc/admin.inc) [<a href='function.include-once'>function.include-once</a>]: failed to open stream: No such file or directory - /...../...mysite.../includes/theme.inc - line 593

However there is such file.

call_user_func_array() [<a href='function.call-user-func-array'>function.call-user-func-array</a>]: First argument is expected to be a valid callback, 'theme_simple_access_form' was given - /...../...mysite.../includes/theme.inc - line 597

And please see that I found another similar discussion in the support forum...

Comments

gordon’s picture

gordon commented
Status: Active » Fixed

You need to clear the cache so that the theme registory is rebuilt.

kecsi’s picture

kecsi commented

Yes, you right. Thank you.

Status: Fixed » Closed (fixed)

Automatically closed -- issue fixed for two weeks with no activity.