Invalid node id specified.

[DivineSpear]

[S]Hello there

I just installed the latest version (5.6.4 Patch Level 1). But when opening a topic, I get the error that is written in the topic title. (Invalid node id specified.) What is the solution to this problem?

Notes: I found the Turkish language pack from the internet and downloaded it. I installed it via admin panel. I thought the problem might be because of the language pack I downloaded. I changed the language of the forum back to english (original) language. I tried opening a thread again. I got the same error again. I guess this must be another problem. I would be very happy if you help.

Thanks

IMPORTANT UPDATE: I can't create channels from admin panel. I even tried from the Site Edit option on the forum home page and couldn't create it. I think this error will appear in many parts of the forum.
[/S]

Dear Forum Mods & Admins

I want this issue to be completely (permanently) deleted.

I'd like to request that this be done.

Thanks.