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Joomla! 1.5.8 installed on II6 with PHP 5.2.6 and mySQL 5.0.67.
I overcame issues getting the installer to recognize mySQL, but once I did, installation went fine and all functions seems to work with the exception of Global Configuration in the Admin section.

I have this all installed on an internal server and have everything set to writable just to eliminate that issue anywhere.

Going to Global Configuration produces:

PHP Warning: call_user_func_array() [function.call-user-func-array]: First argument is expected to be a valid callback, 'JCacheStorage._apc::test' was given in C:\sites\Joomla-test\libraries\joomla\cache\cache.php on line 143 PHP Warning: call_user_func_array() [function.call-user-func-array]: First argument is expected to be a valid callback, 'JCacheStorage._eaccelerator::test' was given in C:\sites\Joomla-test\libraries\joomla\cache\cache.php on line 143 PHP Warning: call_user_func_array() [function.call-user-func-array]: First argument is expected to be a valid callback, 'JCacheStorage._file::test' was given in C:\sites\Joomla-test\libraries\joomla\cache\cache.php on line 143 PHP Warning: call_user_func_array() [function.call-user-func-array]: First argument is expected to be a valid callback, 'JCacheStorage._memcache::test' was given in C:\sites\Joomla-test\libraries\joomla\cache\cache.php on line 143 PHP Warning: call_user_func_array() [function.call-user-func-array]: First argument is expected to be a valid callback, 'JCacheStorage._xcache::test' was given in C:\sites\Joomla-test\libraries\joomla\cache\cache.php on line 143 PHP Warning: call_user_func_array() [function.call-user-func-array]: First argument is expected to be a valid callback, 'JSessionStorage._apc::test' was given in C:\sites\Joomla-test\libraries\joomla\session\session.php on line 272 PHP Warning: call_user_func_array() [function.call-user-func-array]: First argument is expected to be a valid callback, 'JSessionStorage._database::test' was given in C:\sites\Joomla-test\libraries\joomla\session\session.php on line 272 PHP Warning: call_user_func_array() [function.call-user-func-array]: First argument is expected to be a valid callback, 'JSessionStorage._eaccelerator::test' was given in C:\sites\Joomla-test\libraries\joomla\session\session.php on line 272 PHP Warning: call_user_func_array() [function.call-user-func-array]: First argument is expected to be a valid callback, 'JSessionStorage._memcache::test' was given in C:\sites\Joomla-test\libraries\joomla\session\session.php on line 272 PHP Warning: call_user_func_array() [function.call-user-func-array]: First argument is expected to be a valid callback, 'JSessionStorage._none::test' was given in C:\sites\Joomla-test\libraries\joomla\session\session.php on line 272 PHP Warning: call_user_func_array() [function.call-user-func-array]: First argument is expected to be a valid callback, 'JSessionStorage._xcache::test' was given in C:\sites\Joomla-test\libraries\joomla\session\session.php on line 272

I have seen this issue referred to in another post, somewhere else, but a resolution was not posted.

Thanks in advance for any advice.

I can open the Global configuration through the admin consolde but can't edit it even after I set security.

I have the exact same problem, only on debian linux with php5.2 mysql 5.0.32

I get all this nonsense (see attachment), plus the php error calls.

This is the latest version of Joomla 1.5.9, fresh install with sample data

I had to apply some really unsafe settings to get joomla to work on IIS7:
1. IUSR full control to joomla and subfolders
2. IIS_USRS full control to joomla and subfolders
(one of these should go away)
3. IUSR full control sessions
4. IIS_USRS full control sessions
(one of these should go away)
5. Deleted manual PHP installation and use msi installer
6. add phprc=application path to evenironement
7. Fixed all manual reference for php
--
I Have to figure out what I can remove and lock down before I would consider putting this on a public facing server.
--
The phpbb backup site running on the same server didn't require any of this to function.

check to see if you have any ._ files on the server. They will be hidden, just delete them if you find them and the problem should go away

Thanks shaboomi

I had a similar problem in Global Configuration after my one-click install of Joomla 1.5.10, upgraded soon after to 1.5.12.

I was in 1.5.12 already when I noticed the Global Configuration warning messages.

Anyway, I went into the '/libraries/joomla/cache' and '/libraries/joomla/session' folders (as displayed by the warning messages) and deleted all files beginning with a dot, e.g. ._cache.php. Doing so removed all the warning messages in Global Configuration for me. Hope these help.

i was having a similar problem but what i did was to manually edit the global configuration file , then cleared cache just to make sure everything would work just fine and fortunately it did
i am running joomla on IIS server

I am running Joomla 1.5.15 and I simply moved the site to a different directory when this issue appeared in Global Configuration. Clearing all cache did not help. I did what J9erry026 said above and deleted all files beginning with "._" in both the cache and session directories INCLUDING sub directories. If you do not also clear sub directories of those folders, the issue may still appear.

I did exactly what was talked about above and it solved the problem perfectly.
Instead of deleting the files (I was nervous about losing any data that I might later need)
I created a new sub directory called remove in each of the cache and session directories (as stated above) and broke the links while keeping the file system intact in case I needed to put the files back in their respective areas. It turned out that I didn't have to do it, but I wasn't going to take that risk.

Here's a picture of how I did it if you're nervous, but if not then F@#$ it, just delete them and you should be fine.

Many thanks guys! I'm going to be turning the site over to a client in a couple weeks and having that garbldy gook in there certainly wouldn't fly.

Best,
Searchrider