I will re-install Vbulletin
 

I did something wrong. Replaced the 3.6.8 files to 3.7.1 and now I cant acces the admincp I get this error

Warning: in_array() [function.in-array]: Wrong datatype for second argument in /includes/init.php on line 408

Your submission could not be processed because a security token was missing or mismatched.

If this occurred unexpectedly, please inform the administrator and describe the action you performed before you received this error.

I think I should delete all vbulletin files from ftp and install the 3.6.8 again. (I dont have 3.7.1 and my license is expired).

if you dont have 3.7.1 how did you install it and get this error?

you replaced the files, but did you run the upgrade script ?!

yoursite.com/install/upgrade.php

I replaced the files, now I am running install/upgrade.php and now it says:

Step 3) Creating Tables

The following is a list of all tables found in your database. Tables that are recognized as part of vBulletin have been selected for you. There may be other tables listed that were not recognized - these will be highlighted in the list.

All selected tables and their contents will be permanently and irreversibly deleted from the database when the Delete Selected Tables button is clicked.

Click here if you would like to return to the install process without deleting any tables.

vBulletin and Jelsoft Enterprises Ltd. can accept no responsibility for any loss of data incurred as a result of deleting database tables.

I have backup, should I do that ?

if these tables are from external tools, just uncheck them...

if you are unsure, just post your problem at the members support system at vbulletin.com

If you get the above message, then you are not running upgrade.php, but install.php.

PS What is the URL to your board?