Little problem with client error!! plz help

Heya all...i have problem with client...idk why i my client close alot time and i get error something like this ---> [Only registered and activated users can see links. Click Here To Register...]
any know what is reason for get this error???? plz help if someone know thx

What will you make?
Have you an own Server or what?
More Infos, please.

#Sry for my bad english...

yes i have my own server,and i have problem with this error...example i add just before new mount,and when i try attack mobs from my mount,client immediately close and i get error,i show you how look...in syser i get this:

CEffectManager::RegisterEffect - LoadScript() Error
ResourceManager::GetResourcePointer: NOT SUPPORT FILE d:\ymir

Idk where is problem....