Keep getting this stack trace

java.lang.NullPointerException
at net.elseland.xikage.MythicMobs.Skills.Mechanics.MessageSkill.<init>(MessageSkill.java:27)
at net.elseland.xikage.MythicMobs.Skills.AbstractSkill.getSkillMechanic(AbstractSkill.java:400)
at net.elseland.xikage.MythicMobs.Skills.Skill.<init>(Skill.java:63)
at net.elseland.xikage.MythicMobs.Skills.SkillManager.loadSkills(SkillManager.java:38)
at net.elseland.xikage.MythicMobs.IO.Load.Configuration.LoadAll(Configuration.java:144)
at...

Keep getting this stack trace