Why won't this work? (Warning: This is Jass)

//###########################################################################
constant function cs_H2I takes handle h returns integer
return h
return 0
endfunction

constant function cs_I2U takes integer i returns unit
return i
return null
endfunction

constant function cs_I2T takes integer i returns trigger
return i
return null
endfunction

constant function cs_I2TT takes integer i returns texttag
return i
return null
endfunction

constant function cs_I2It takes integer i returns item
return i
return null
endfunction

constant function cs_I2D takes integer i returns destructable
return i
return null
endfunction

constant function cs_I2FM takes integer i returns fogmodifier
return i
return null
endfunction

//###########################################################################
function SetAggro takes handle mob, integer player, real aggro returns nothing
  call StoreReal(udg_cs_cache, I2S(cs_H2I(mob)), "aggro" + I2S(player), aggro)
endfunction

//===========================================================================
function InitTrig_CS_Main_Script takes nothing returns nothing
set udg_cs_cache = InitGameCache("WOWDATA.w3v")
endfunction