You are accessing the server from an untrusted domain. Please contact your administrator. If you are an administrator of this example, configure the "trusted_domains" setting in config / config.php. An example configuration is provided in config / config.sample.php. Depending on the configuration, as an administrator, you may also be able to use the button below to trust this domain
This version is highly outdated [1] and was releases more then 2 1/2 years ago. Please don't run such outdated version on productive environments as this contains tons of known bugs (at least one directly related to the trusted domains feature) [1] and public security vulnerabilities [2].
When running such outdated version you're causing e.g. effort of people helping you where the issue might be already fixed in newer available versions.
As @kljhlkhglklfgh says, update your Owncloud to the most recent. For your own sake.
For the trusted domains I've added:
localhost address for the server - i.e. 'localhost'
the loopback address for the server - i.e. '127.0.0.1' (these 2 addresses allow me to access the Owncloud admin console from the server commandline if anything goes wrong)
the internal IP address which the Owncloud instance is hosted on - e.g. 192.168.1.1 (this allows me to access Owncloud admin from the local network)
the Internet routable DNS name the Owncloud instance answers on - e.g. owncloud.bernard.com (this allows me to access Owncloud from the Internet)
I'm not sure if you need to make your OC Internet accessable, but I'd suggest you need 1, 2, 3 above.