Class cl_gui_pdfviewer , Dump in method CREATE_TOOLBAR.

Hello ,

Guys I have a problem with method in line:

" pass toolbar settings to local class
this_event_handler->document_close = document_close.

I got a dump with the following description :

"You attempted to use a 'NULL' object reference (points to 'nothing')

access a component (variable: " ").

An object reference must point to an object (an instance of a class)

before it can be used to access components.

Either the reference was never set or it was set to 'NULL' using the

CLEAR statement."

Im providing the following parameters :

tool_buttons = 'X'
view_buttons = view_buttons_active

Do yo know any other alternative class ? .

thank you very much.