Form submission error

We have installed an ODK Aggregate server. You can load a form on the server and download a form on a tablet. But when you submit a form to the server, you receive an error message. When I look in the tomcat log, here is the message that appears in the logs:
"" May 02, 2017 11:48:20 PM refreshReachableGrantedAuthorities
INFO: Executing: refreshReachableGrantedAuthorities
May 02, 2017 11:48:20 PM reloadPermissions
INFO: Executing: reloadPermissions
Someone could help me