The sever is outdated
I went on minecraft today to go on the sever and it said it was outdated.
Hello! On August 31, 2017, the server switched from 1.8 - 1.11.2 to now only 1.12.1 (for now). Sorry for the confusion! In the future, when 1.12.2 and up become more stable, the server will likely upgrade in the future. Hope this helps!