Unespextec error occurs when uploading license file

Hi,
I'm uploading license file just bought, but appears a dialog box with the message An unexpected error occurred (500). Check the log.
I'm trying to use Serviio on Ubuntu 15.10
I'm uploading license file just bought, but appears a dialog box with the message An unexpected error occurred (500). Check the log.
I'm trying to use Serviio on Ubuntu 15.10