Can i please have help with this code it says it cannot understand "loop all players" this is my code

[B7te]

loop all players:
if player's offhand tool is white stained glass named "&f&lInvisibility &7&lStone" with lore "&f&lHold In Offand To Be Granted The Power Of Invisibility":
apply Invisibility 1 to player for 999 days
else:
remove Invisibility from the player

command /InvisStoneTest:
trigger:
give player white stained glass named "&f&lInvisibility &7&lStone" with lore "&f&lHold In Offand To Be Granted The Power Of Invisibility"

 

[DPPPPP]

try using
on load:
loop all players:
code here blah blah blah

 

[B7te]

try using
on load:
loop all players:
code here blah blah blah

Will this have it running the whole time?

 

[BaeFell]

Will this have it running the whole time?

Try using every second:

 

[B7te]

Try using every second:

I figured it out but thank you

 

[BaeFell]

I figured it out but thank you

If possible, please share what you did to fix it. If someone else has the same problem, you might end up helping them out!