Oracle : Ошибка ORA-27480

"window \"%s\" is currently open"
*Cause: An attempt was made to drop a window that is currently open, or
to manually open a window while another window is already open.
*Action: Close the window that is open and then reissue the command, or
reissue the command while setting the force option to TRUE.

Попробовать перевести

Поискать эту ошибку на форуме