I am trying to add into my game techinques which my friend gave me the source code to so but i have some errors including them

what does these mean

hud.dm:61: Inconsistent indentation.
hud.dm:68: Inconsistent indentation.
hud.dm:89: Inconsistent indentation.
hud.dm:105: Inconsistent indentation.
hud.dm:106: Inconsistent indentation.
hud.dm:107: Inconsistent indentation.
hud.dm:108: Inconsistent indentation.
hud.dm:109: Inconsistent indentation.
hud.dm:112: Inconsistent indentation.
hud.dm:115: Inconsistent indentation.
hud.dm:116: Inconsistent indentation.
hud.dm:118: Inconsistent indentation.
hud.dm:117:warning: empty 'else' clause
hud.dm:119: Inconsistent indentation.
hud.dm:120: Inconsistent indentation.

here is what is on the lines from 61 to 120

[obj/Kamehameha
verb
Kamehameha(mob/M in oview(6))
set name = "Kame Hame Ha"
set category = "Techniques"
var/amount = input("How much energy do you wish to put into it?") as num|null
amount = round(amount)

if(amount >= 1)
if(amount > usr.powerlevel)
view()<<sound('kamehameha.wav')
usr.kame = 1
usr.overlays += /obj/kame
sleep(10)
view(6) << "[usr]: Kaaaa....."
sleep(5)
view(6) << "[usr]: Meeee....."
sleep(10)
view(6) << "[usr]: Haaaa....."
sleep(5)
view(6) << "[usr]: Meeee....."
sleep(10)
view(6) << "[usr]: HAAAA!!!!!"
view(6) << "From putting too much energy in the Kame Hame Ha wave, [usr] explodes!"
usr.overlays -= /obj/kame
usr.powerlevel = 0
usr.kame = 0
usr.overlays -= /obj/kame
usr.Die()
return
if(amount <= usr.powerlevel)
view()<<sound('kamehameha.wav')
usr.kame = 1
usr.overlays += /obj/kame
sleep(10)
view(6) << "[usr]: Kaaaa....."
sleep(5)
view(6) << "[usr]: Meeee....."
sleep(10)
view(6) << "[usr]: Haaaa....."
sleep(5)
view(6) << "[usr]: Meeee....."
sleep(10)
view(6) << "[usr]: HAAAA!!!!!"
usr.overlays -= /obj/kame
if(M.z == usr.z)
usr.overlays -= /obj/kame
s_missile('kame.dmi', usr, M)
usr.kame = 0
usr.powerlevel -= amount
if(M.absorb == 1)
view(6) << "[M] absorbs [usr]'s Kame Hame ha!"
M.powerlevel += amount
if(M.absorb == 0)
M.powerlevel -= amount
view(6) << "[usr] shoots a Kame Hame Ha at [M]!!!"
M.Die()
usr.KO()
else
usr << "You launch your Kame Hame Ha, but [M] is out of sight."
usr.overlays -= /obj/kame
usr.kame = 0]

That is from lines 61 to 120

Can anyone help?</<sound></<sound>