[Forum] " You did not select any valid threads " error

[shopdiaoc]

I am using a Direct Admin Hosting for my forum, when i choose one or many pots (through sticking them) and delete them then the error " You did not select any valid threads " appears (if i access to only one post and del it, it was deleted normally). I dont know why i got the error.
If someone know how to fix it, please help me !
Thanks you so much !

[Lynne]

Create a new style with no parent:

• Styles & Templates > Style Manager > Add New Style
• Parent Style: No Parent Style
• Title: Default vBulletin
• Allow User Selection: Yes
• Save

Then browse the site using that totally default vbulletin style - do you still have the same problem?

If so, try disabling your modifications/plugins and see if you still have this problem.
Note: To temporarily disable the plugin system, edit includes/config.php and add this line right under <?php

define('DISABLE_HOOKS', true); 

[shopdiaoc]

Create a new style with no parent:

• Styles & Templates > Style Manager > Add New Style
• Parent Style: No Parent Style
• Title: Default vBulletin
• Allow User Selection: Yes
• Save

Then browse the site using that totally default vbulletin style - do you still have the same problem?

If so, try disabling your modifications/plugins and see if you still have this problem.
Note: To temporarily disable the plugin system, edit includes/config.php and add this line right under <?php

define('DISABLE_HOOKS', true); 

thanks you admin, i did as you said, however it still does'nt work . I tested my fourm source (the same source) in Plesk Windows Hosting --> it's normal . So i think the error just appears in Direct Admin Linux Host . I asked host-technicians checking it for me, but they reply that the host is normal (others websites behave good) .

[Lynne]

You have a duplicate of your site on another server using Windows and it works fine? Is it using a backup you just made of the site? And all the files are exactly that same?

This works just fine on my site which is on a linux server, so it seems very unlikely that this is a server issue.

Run maintenance > diagnostics > suspect file versions and make sure all your files are default (none says "does not contain expected contents")