Xibo 2.1.1 upload server currently unavailable


I’m create in my hosting and configure Xibo.
But i’m add image in Library and not working i’m see message “Upload server currently unavailable”

PHP 7.0
Memory limit: 256
max execution: 300
Upload max filesize: 35Mb
Post_max_size: 35 Mb

I’m change name folder of library but not working, can you help me?
Folder library is out of website folder but not working, i’m set permissions 777chmod.

Thank you!