Can't activate plugin

Hi,

I’m trying to activate the plugin and get every time the error-message:WP-SimpleViewer cannot assign full access permissions (777) to the wp-content/uploads folder.But all permissions of uploads are on 777 even of all sub-folders. Every other upload works. I deactivated every other plugin but still no success… (wp-version 3.5.1, wp-simpleviewer.2.3.2.1). What could cause this problem?

Any help will be apprecited.

I didn’t find the right solution from the Internet.

References:

http://www.simpleviewer.net/forum/viewtopic.php?id=17376

Bitcoin Animation Video

Thank you.