black screen - html5 animation- application building phonegap

hi

I am using cativate 9 to build a sample elearning course.

no problem with inserting html5 animation file(oam extension) in my project and publishing it.

but after building app with phonegap service the screen goes black every where i used "html5 animation". although the animation itself can be seen but other parts of that slide are invisible and black.

I would appreciate your help in this matter.