Title: Please Help: Error when table prefix changed.
Last modified: August 19, 2016

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# Please Help: Error when table prefix changed.

 *  Resolved [Hazel Z.](https://wordpress.org/support/users/cadencehart/)
 * (@cadencehart)
 * [17 years, 5 months ago](https://wordpress.org/support/topic/please-help-error-when-table-prefix-changed/)
 * hi. i hope you can help. i am trying to change the table prefix in my wordpress
   installation since i read online that this is necessary to prevent hijacking.
   my wordpress version is 2.6.5.
 * i set my permissions for wp-admin.php to 775 and i followed the ff. steps diligently:
 * > 1. backup your wordpress database to a sql file (you can use phpmyadmin)
   >  2.
   > open that *.sql file (make another copy first) using text editor, then find
   > and replace all “wp_” prefix to “something_”. 3. now, drop all tables of your
   > wordpress databases (don’t drop the database) 4. import the *.sql file which
   > has been edited before into your wordpress databases. 5. and lastly, edit your
   > wp-config.php file and change the $table_prefix = ‘wp_’; to $table_prefix =’
   > something_’; 6. you may find that your plugins are deactivated automatically
   > when this happens, so you’ll want to activate them again if that’s the case…
   > I’d recommend deactivating them prior to doing this anyway as a precaution.
 * so i thought everything should be fine…but then when i accessed my admin page,
   it returned the ff. error:
 * > Warning: Cannot modify header information – headers already sent by (output
   > started at/home/myusername/public_html/mydomainname.com/blog/wp-config.php:
   > 63) in /home/myusername/public_html/mydomainname.com/blog/wp-includes/pluggable.
   > php on line 770
 * i also tried installing wp security scan to do the renaming automatically but
   it does not work. it tellsme the username i am using does not have adequate permissions
   although i have given my username all the rights available.
 * i can no longer access my admin page.
 * what should i do next? please help. it is greatly appreciated.

Viewing 4 replies - 1 through 4 (of 4 total)

 *  Thread Starter [Hazel Z.](https://wordpress.org/support/users/cadencehart/)
 * (@cadencehart)
 * [17 years, 5 months ago](https://wordpress.org/support/topic/please-help-error-when-table-prefix-changed/#post-921990)
 *  Thread Starter [Hazel Z.](https://wordpress.org/support/users/cadencehart/)
 * (@cadencehart)
 * [17 years, 5 months ago](https://wordpress.org/support/topic/please-help-error-when-table-prefix-changed/#post-921993)
 * i’d really appreciate your help. thanks.
 *  [mrmist](https://wordpress.org/support/users/mrmist/)
 * (@mrmist)
 * [17 years, 5 months ago](https://wordpress.org/support/topic/please-help-error-when-table-prefix-changed/#post-921994)
 * You’ve added a space, blank line or similar to your wp-config.php when you edited
   it to change the prefix.
 * You need to remove whatever it is that you’ve added around line 63.
 *  Thread Starter [Hazel Z.](https://wordpress.org/support/users/cadencehart/)
 * (@cadencehart)
 * [17 years, 5 months ago](https://wordpress.org/support/topic/please-help-error-when-table-prefix-changed/#post-922000)
 * thanks so much. it’s working now. 🙂

Viewing 4 replies - 1 through 4 (of 4 total)

The topic ‘Please Help: Error when table prefix changed.’ is closed to new replies.

## Tags

 * [cannot modify header](https://wordpress.org/support/topic-tag/cannot-modify-header/)
 * [WordPress Error](https://wordpress.org/support/topic-tag/wordpress-error/)

 * 4 replies
 * 2 participants
 * Last reply from: [Hazel Z.](https://wordpress.org/support/users/cadencehart/)
 * Last activity: [17 years, 5 months ago](https://wordpress.org/support/topic/please-help-error-when-table-prefix-changed/#post-922000)
 * Status: resolved

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