[Help] Got DC when edit Skills

Is there a way to edit skills ?
Like action speed, damage, cooldown, etc.
What ive done right now only edit skill cooldown and damage, but still got error/disconnect from server. Here what i change :
- skillleveltable_characterclericpve.dnt
- skilltable_charactercleric.dnt

Columns :
- _EffectClassValue
- _EffectClassValueDuration
- _DelayTime

Maybe anyone already done this,,, ?