hi plz translation korean

[homer789]

this image is a game c9 korean server im stuck.

I do not understand this message you can translate please.
I do not know what happens, but I can not choose the type of blade dancer, with characters you can choose the other 2 classes are warden and slayer.

[Climbatiz]

google translate says

"To try the former class is equipped with items that can not be mounted.

Please turn off after the former."

전직하려고 하는 클래스가 장착할 수 없는 아이템을 장착하고 있습니다.

해제 후 전직해주세요.