Can't activate plugin


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. What could cause this problem?

Any help will be apprecited.

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


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Thank you.