and what region are you?  US?

you see, there is no US-Sylvanas ... therefore you must be EU ... but your realmList is pointing to US.

that's your problem

As I wrote on the previous post ... tried it on Twisting Neather ( which is EU realm aswell like sylvanas) and it shows US aswell, so I guess thats not my problem buddy, and even if it is tell me which file ti fix or what command to write.

What you need to do is modify your Realmlist.wtf to represent the EU settings and then you should be ok. 

The reason it works on Twisting Neather is becuase there is a EU Twisting Neather, and a US Twisting Neather. BUT there is only a EU Sylvanas, so when it tries to find the US Sylvanas, it just craps out.

There used to be realmlist.wtf information on wowhead, but I have been told that it is out of date. 

Not sure how your realm list would have become miconfigured, it normally ends up this way when someone tries to connect to a private server.

You can try here for information on fixing it, but im not sure if its accurate. 

 

there is no US-slyvanas... but there is. US-twisting nether.  

which means... it will work when you're on twisting nether... but not on slyvanas.

problem here is that you've changed your realmlist.wtf file... for 'some' reason... and you didn't change it back properly.  change it so it points to EU and everything will work

mhm I see, thanks for the help m8. Blizzard removed the realmlist.wtf from the game, now I don't know what to edit really :)

OK, fixed it. For the ppl with the same problem, to change the logon from US to EU, in your worldofwarcraft/data/enUS  change the enUS to enGB and when u start the game it will atomatically create the stuff that it needs.

just renaming the folder?