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I have a serious problem, after uninstall extension from magento connect i see blank magento admin, nothing is visible to find out.

I also removed files under downloader/.cache directory of magento root but nothing get fixed. Any solution will be appreciated.

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    can you uncomment ini_set('display_errors', 1); in your index.php and also enable the developer mode code to see if it outputs any errors? If this is a live webshop I suggest putting an IP check around it – Sander Mangel Aug 17 '13 at 17:35
  • Have you contacted the module developer for help as well? They may know why/what. It can be caused by EAV attributes that reference a class file in that module, which now no longer exist. Check the modules install folder (setup scripts) for any attributes created and remove them from the database. – ProxiBlue Aug 17 '13 at 22:15
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    Can you follow this guide and report back your findings: magento.stackexchange.com/a/429/336 – philwinkle Aug 18 '13 at 0:31
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again, this is pretty easy to debug. example: Apache server: login to your server and: find Apache error log location: first get the configuration file:

~/#: httpd -S
VirtualHost configuration:
*:80                   is a NameVirtualHost
port 80 namevhost example.com (/etc/httpd/conf/httpd.conf)
Syntax OK

look for ErrorLog path:

~/#: grep ErrorLog /etc/httpd/conf/httpd.conf
ErrorLog "/etc/httpd/logs/error_log"

use tail to read the latest log entries:

~/#: tail -f /etc/httpd/logs/error_log

Nginx server:

~/#: cd /var/log/nginx
~/#: tail -f error.log

Magento internal logs: if you are not sure where is the shop installed:

~/#: updatedb
~/#: locate app/etc/local.xml
~/#: /var/www/html/shop.com/app/etc/local.xml

if you are the owner or you know where is the shop:

~/#: cd /var/www/html/shop.com/var/log
~/#: ls
~/#: exception.log   system.log
~/#: tail -f system.log

open your browser and go to your admin page (or any page that fails or blank, etc), click it few times, press F5, etc. and see your error log fills-in with error messages.

but obviously you have to flush the cache storage and clear opcode cache as well, dont forget about memcached and redis :)

p.s: This example uses the default options. Your server may use different configurations and paths.

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