EssentialsX version (run /essentials): 2.0.1

Server software (run /version): 1.7.10

Server (logs/latest.log):

EssentialsX config (plugins/Essentials/config.yml):

Details:

You are running an unsupported (1.7) version, please follow the instructions on how to build the latest craftbukkit/spigot at http://www.spigotmc.org/wiki/buildtools/

EssentialsX no longer supports Minecraft 1.7.10. Update to a more recent Minecraft server for support. (Not to mention we have literally no idea what the error is without a log.)