Code (Text):

1. command /activeduty [<text>]:
2.     permission: staff.active
3.     trigger:
4.         if {vias.%player%} is not set:
5.             send "&cIf you are caught abusing this (we have logs) you will be demoted and possibly banned." to player
6.             set {vias.%player%} to 1
7.             set {loc} to location of block at location of player
8.             send "&9You toggled active mode!" to player
9.             execute console command "/fly %player% on"
10.             execute console command "tab player %player% tagsuffix &c&lON-DUTY&8-&e%arg-1%"
11.         else:
12.             send "&9You toggled active mode!" to player
13.             execute console command "/fly %player% off"
14.             wait 1 tick
15.             clear {vias.%player%}
16.             teleport player to {loc}
17.             execute console command "tab player %player% tagsuffix &f"
18.             send "&cIf you are caught abusing this (we have logs) you will be demoted and possibly banned." to player
19.            
20. on damage:
21.     if {vias.%victim%} is set:
22.         cancel event
23.  
24. command /freeze [<text>]:
25.     Permission: staff.freeze
26.     trigger:
27.         if arg-1 is set:
28.             set {_p} to arg-1 parsed as offline player
29.             if arg-1 parsed as player is online:
30.                 if arg-1 parsed as player has permission "staff.bypass.freeze":
31.                     send "&bYou cannot freeze that person!"
32.                 else:
33.                     if {froze.%arg-1%} is not set:
34.                         set {froze.%arg-1%} to true
35.                         send "You have been frozen by %player%" to arg-1 parsed as offline player
36.                     else:
37.                         clear {froze.%arg-1%}
38.                         send "You were unfrozen by %player%" to arg-1 parsed as offline player
39.                        
40. on player move:
41.     if {froze.%player%} is set:
42.         cancel event

Here are the reasons why it gave a couple errors:
Line 28: There's no indentation canceling out the if statement on line 27
Line 36: The 'if' in the 'else if:' is not required since you didn't include another if statement. There was also an extra space between the 'if' and the ':'
Argument issues:
Since arg-1 was technically a text, it doesn't know how to check if a text is online or how to send a message to a text. Including a 'parsed as offline player' (I know you want to check if the player is online, but it works) will fix it. You could also change the [<text>] to [<player>] and it would fix it (though you would need to remove all of the 'parsed as offline player'). Have a good day!