Incorrect number of subscript accessing external object property loadfile in open event

Hi

I used  the following method to  view pdf  OLE Object Control -> Insert Control -> Then I select Adobe pdf reader. After that I wrote the following script in the open event of the form

ole_1.object.loadfile("H:\document\empdoc.pdf") . But when I run the application the following error is coming

"Incorrect number of Subscript Accessing external object property loadfile in open event" please can u help.

With Thanks

Pol