CS2D 
have detected error on my head and showdamage lua
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i have detected 2 error on my scripts and need help to fix that.
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LUA ERROR: sys/lua/hc/core/showdamage.lua:22: attempt to perform arithmetic on field '?' (a nil value)
-> sys/lua/hc/core/showdamage.lua:22: in function <sys/lua/hc/core/showdamage.lua:20>
-> in Lua hook 'hit', params: '©255000000 -> sys/lua/hc/core/showdamage.lua:22: in function <sys/lua/hc/core/showdamage.lua:20>'
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LUA ERROR: sys/lua/awp/head.lua:28: attempt to perform arithmetic on a boolean value
-> sys/lua/awp/head.lua:28: in function <sys/lua/awp/head.lua:25>
-> in Lua hook 'hit', params: '©255000000 -> sys/lua/awp/head.lua:28: in function <sys/lua/awp/head.lua:25>'
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my head lua:
function onhit(id,source,weapon,hpdmg,apdmg)
local accuracy1 = 0
local accuracy2 = 0
local difx = player(id,"x") - player(source,"x")
local dify = player(id,"y") - player(source,"y")
local goang = math.atan2(dify,difx)
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my showdamage lua:
function hitshake(id,src,wpn,hp)
if hp > 0 then
sd.damage[src] = sd.damage[src] + hp
sd.show(src)
sd.showtimer[src] = 10
end
end
TrialAndError