GodFist Not Working

[God Hand] lua/weapons/god_hand/shared.lua:980: attempt to call global ‘CanUseGodHand’ <a nil value>
1. unknown - lua/weapons/god_hand/shared.lua:980

Timer Failed! [Simple][@lua/weapons/god_hand/shared.lua <line 979>]

the god hand shared.lua from line 964 t0 998:

if SERVER then
if self.Owner.Dashing then
damage = damage * 2
self.Owner:EmitSound(“vo/heavy_meleeing0” … math.random(1, 2) … “.wav”, 80, math.random(95, 105))
self.Owner.Dashing = false
self.HitExplosion = true

		vec = self.Owner:GetAimVector()
		vec.z = 0
		self.Owner:SetLocalVelocity(vec * 1000)
	end
	
    self.Owner:EmitSound("weapons/bat_draw_swoosh1.wav", 80, math.random(95, 105))
    self.ComboDelay = CurTime() + 0.2

    timer.Simple(0.1, function()
		if not CanUseGodHand(self.Owner) then
			return
		end
		
        local aimVec = self.Owner:GetAimVector()
    
        td.start = self.Owner:GetShootPos()
        td.endpos = td.start + aimVec * 55
        td.filter = self.Owner
        td.mins = Vector(-8, -8, -8)
        td.maxs = Vector(8, 8, 8)
        
        local trace = util.TraceHull(td)
        
        if trace.Hit then
			if self.HitExplosion then
				ParticleEffect("cstm_incendiary_hit", trace.HitPos, self.Owner:EyeAngles(), nil)
				self.HitExplosion = false
			end

Look for the function CanUseGodHand.

then what do i do

Did you find it? If so, make sure the file containing it is loaded before the code you posted.