Why is this code not working?

[succccc]

on mine:
  if event-block is oak logs:
    set {_broken} to placeholder "statistic_mine_block:oak_log"
    if {_broken} is 8:
      if {%player%.cs.1} is 0:
        send "&aChallenge completed! &fChop 8 oak wood"
        set {%player%.cs.1} to 1
        set {%player%.cc.1} to "&aCompleted"

It doesn't give any errors, it just doesn't work. I installed the placeholder plugin and it works, just this snippet doesn't.

 

[AHappyLittleSloth]

on mine:
  if event-block is oak logs:
    set {_broken} to placeholder "statistic_mine_block:oak_log"
    if {_broken} is 8:
      if {%player%.cs.1} is 0:
        send "&aChallenge completed! &fChop 8 oak wood"
        set {%player%.cs.1} to 1
        set {%player%.cc.1} to "&aCompleted"

It doesn't give any errors, it just doesn't work. I installed the placeholder plugin and it works, just this snippet doesn't.

Try:

on mine:
  if event-block is oak log:
    set {_broken} to placeholder "statistic_mine_block:oak_log" from player
    if {_broken} equals 8:
      if {%player%.cs.1} is 0:
        send "&aChallenge completed! &fChop 8 oak wood"
        set {%player%.cs.1} to 1
        set {%player%.cc.1} to "&aCompleted"