HI,
I am a new for this platform,

I am using silverstripe v2.4.7 and it is working fine. now i want to install image gallery module.

for that i have download dataobject_manager, swfupload, image_gallery from www.silverstripe.org website.
after that i extract and put in to application root folder and
i build http://mysite/dev/build/?flush=1

after that i logined in to admin and select image gallery page from the dropdown list and i clicked on go button

but it is giving error "error loading page"

please give me a solution for this problem.