Couldn't connect to Realms error

In the startup sequence, this is displayed:

[18:00:12 INFO]: Client> [18:00:12] [MCO Availability Checker #1/ERROR]: Couldn't connect to Realms
[18:00:12 INFO]: Client> csp: 
[18:00:12 INFO]: Client> 	at cru.a(SourceFile:253) ~[14w27a.jar:?]
[18:00:12 INFO]: Client> 	at cru.b(SourceFile:88) ~[14w27a.jar:?]
[18:00:12 INFO]: Client> 	at bqw.run(SourceFile:208) [14w27a.jar:?]