!NEED HELP ASAP, PLEASE! Sending action bar to a player stored in a metadata value

[ZhengYueMoon]

So I have made a skript look like this:

on damage:
  if victim is not a player:
    if attacker is a player:
      if name of attacker's tool is "&6Sweeper":
        loop all mobs in radius 5 of victim:
          if loop-entity is not victim:
            damage loop-entity by damage / 2
            set metadata value "attacker" of loop-entity to attacker

which works fine(in this part)
however in the some other parts of the code, I want to give a custom EXP value on mobs killed, and using direct damage to loop-entity won't count as being attacked by the player, this is why I used metadata value in the code up there.
so the code looks like this

on death:
  if metadata value "attacker" of victim is "<none>":
    if attacker is a player:
      if victim is a mob:
        # a lot of setting exp value and stuff, too long so i skipped it
        if {_exp} is not 0:
          set {_exp} to {_exp} / {lv::%attacker%}
          add {_exp} to {exp::%attacker%}
          send action bar "<green>Current EXP: %{exp::%attacker%}%<green>%% <gray>(+%{_exp}%%%)" to attacker
  else:
    if victim is a mob:
      set {_attacker} to metadata value "attacker" of victim parsed as a player
      #same thing here
      if {_exp} is not 0:
        set {_exp} to {_exp} / {lv::%metadata value "attacker" of victim%}
        add {_exp} to {exp::%metadata value "attacker" of victim%}
        send action bar "<green>Current EXP: %{exp::%metadata value "attacker" of victim%}%<green>%% <gray>(+%{_exp}%%%)" to {_attacker}

all the other codes works fine except for the last line "send action bar to {_attacker}", which Skript "does not understand the effect" since send action bar to a variable even if i parsed as a player (as u can see)
so I rlly need help for this since without this part of the code, my server cannot run properly and I have to kick out all the players before I can fix this, so I rlly need ur help.

Big Thanks!

 

[sluhtie]

You will need to parse the variable in the send action bar expression as well, for it to work