[Script] FireRed (CFRU) freezes when attempting to run script after walking one step

[The_Fatnaz]

I'm trying to run a script after a certain number of steps. I followed the CFRU documentation for the "Walking Specials" part. However, the game always freezes when I try to use Loadpointer and Special 0x81 to run a script every step taken. Intrestingly, the game music continues playing, but the visuals in the screen are completely halted. This happens even when copy-pasting the exact code in the document.
Code Written:

#dynamic 0x800000

#org @start
Loadpointer 0x0 @WalkingMsg
Special 0x81
release
end

#org @WalkingMsg
Msgbox @msg 0x6
end

#org @msg
= This msgbox will play every single step

Did I set up my CFRU wrong, mess up the code, or is it something wrong with CRFU iteself?
Below is a screenshot of the document that I followed from