Annoying Graphic Error

[Trevor]

What bugs me about the error is its an original D2 monster.

17:42:03.853 Error opening file: DATA\GLOBAL\MONSTERS\G4\COF\G4GHhth.COF
17:42:03.853 Could not add cof file: DATA\GLOBAL\MONSTERS\G4\COF\G4GHhth.COF
17:42:03.853 sAsyncLoadBlock failed on async:1 unittype:1 unitclass:291 unitmode:3 weaponclass:0 wclass:543716456
repeated a billion times....

G4 is the iron golem...
Why is the game looking for the GH mode at all? Monstats2.txt have mGH blank. (IE an original line of code)
Anyone have any ideas?
Thank you in advance.

(The error is produced when I give a skeleton archer a clone of Freezing Arrow.)

EDIT: Error fixed by adding the necessary dccs and cofs (done for all 4 golems while I was at it) but I would still like to know what forced the error on an original coded monster. It's not like the iron golem has never been attacked before.

[kingpin]

I have noticed this multiple times myself, where unit's suddenly require a mode it's not needed.

I have no real answer for why atm, besides do what you did and add the missing mode.