I keep getting the error "There's no world in a periodic event if no world is given in the event"

Here's my code

Code (Text):

1. every second:
2.     loop all players:
3.         if loop-player is in world "GCEarth":
4.             if {s::%loop-player's uuid%} = 0:
5.                 if {m::%loop-player's uuid%} = 0:
6.                     if {d::%loop-player's uuid%} = 0:
7.                         if {h::%loop-player's uuid%} = 5:
8.                             execute console command "lp user %player% group add Casual"
9.                             execute console command "lp user %player% group remove Starter"
10.                             send "&aYou have obtained the &r&a&lSTEM&r&a Rank for reaching 5 Hours played" to loop-player
11.             if {s::%loop-player's uuid%} = 0:
12.                 if {m::%loop-player's uuid%} = 0:
13.                     if {d::%loop-player's uuid%} = 0:
14.                         if {h::%loop-player's uuid%} = 20:
15.                             execute console command "lp user %player% group add Experinced"
16.                             execute console command "lp user %player% group remove Casual"
17.                             send "&aYou have obtained the &r&a&lLEAF&r&a Rank for reaching 20 Hours played" to loop-player
18.             if {s::%loop-player's uuid%} = 0:
19.                 if {m::%loop-player's uuid%} = 0:
20.                     if {d::%loop-player's uuid%} = 2:
21.                         if {h::%loop-player's uuid%} = 2:
22.                             execute console command "lp user %player% group add Pro"
23.                             execute console command "lp user %player% group remove Experinced"
24.                             send "&aYou have obtained the &r&6&1LOG&r&a Rank for reaching 50 Hours played" to loop-player
25.             if {s::%loop-player's uuid%} = 0:
26.                 if {m::%loop-player's uuid%} = 0:
27.                     if {d::%loop-player's uuid%} = 3:
28.                         if {h::%loop-player's uuid%} = 3:
29.                             execute console command "lp user %player% group add branch"
30.                             execute console command "lp user %player% group remove pro"
31.                             send "&aYou have obtained the &r&6&1BRANCH&r&a Rank for reaching 75 Hours played" to loop-player
32.             if {s::%loop-player's uuid%} = 0:
33.                 if {m::%loop-player's uuid%} = 0:
34.                     if {d::%loop-player's uuid%} = 4:
35.                         if {h::%loop-player's uuid%} = 4:
36.                             execute console command "lp user %player% group add tree"
37.                             execute console command "lp user %player% group remove branch"
38.                             send "&aYou have obtained the &r&a&1TREE&r&a Rank for reaching 100 Hours played" to loop-player
39.             if {s::%loop-player's uuid%} = 0:
40.                 if {m::%loop-player's uuid%} = 0:
41.                     if {d::%loop-player's uuid%} = 10:
42.                         if {h::%loop-player's uuid%} = 10:
43.                             execute console command "lp user %player% group add forest"
44.                             execute console command "lp user %player% group remove tree"
45.                             send "&aYou have obtained the &r&2&1FOREST&r&a Rank for reaching 250 Hours played" to loop-player
46.             if {s::%loop-player's uuid%} = 0:
47.                 if {m::%loop-player's uuid%} = 0:
48.                     if {d::%loop-player's uuid%} = 20:
49.                         if {h::%loop-player's uuid%} = 20:
50.                             execute console command "lp user %player% group add grower"
51.                             execute console command "lp user %player% group remove forest"
52.                             send "&aYou have obtained the &r&2&1GROWER&r&a Rank for reaching 500 Hours played" to loop-player