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I was working in a local WordPress website, and it works without any problem. Then i uploaded it to a live server as follow:

  • Uploaded all my local files and folder to the live server.
  • Imported the local DB to Live server.
  • Changed the links in the DB from the (localhost) to my (live domain).
  • changed the config.php file to connect to the DB.

after doing these steps my web site ( Front-end ) is working great without any problem.

But when i logged-in to my dashboard and tried to do any of the following i got instead a white page appear without any error:

  • When trying to disable/activate any plugin.
  • When trying to Update any post.
  • When trying to publish new page/post.
  • When Deleting page/post.

I tried this solutions but didn't solve the problem:

  • I disabled all the plugin to see if any cause a conflict.
  • I tried to use the default theme instead of my custom theme.

Update:

After enabling define('WP_DEBUG', true); as @s_ha_dum say, I got this :

  • Warning: Cannot modify header information - headers already sent by (output started at /......./wp-content/themes/sbr/functions.php:670) in /......../wp-admin/post.php on line 233.
  • Warning: Cannot modify header information - headers already sent by (output started at ............/wp-content/themes/sbr/functions.php:670) in /............./wp-includes/pluggable.php on line 896.
  • Enable debugging. Check your server logs if you have access. – s_ha_dum Apr 5 '14 at 13:08
  • After doing as @s_ha_dum say, I got this : 1. Warning: Cannot modify header information - headers already sent by (output started .../functions.php:670) in ..../wp-admin/post.php on line 233 2. Warning: Cannot modify header information - headers already sent by (output started at ..../functions.php:670) in ...../wp-includes/pluggable.php on line 896 – Ahmed Na. Apr 5 '14 at 16:11
  • Please edit that error into the question. Formatting in comments is very minimal. – s_ha_dum Apr 5 '14 at 16:15

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