Instruction not recognized in MarieJS code

Question

I have been doing this Marie code and it says it has three errors every time I try to assemble it. I'm unsure on how to go about fixing it. I have tried changing a bunch of things but I still end up with 3 or more errors.
It is telling me instructions are not recognized, Here is where the errors appear, I am very very new to all of this so I am still trying to figure out how it all works, apologies if it is something super simple!
Here is the code and below that will be the image of the errors

    org         100
    input
    store       N       
    input
    store       D       
    load        N       
    store       K
    
Outer,  load        K      
    skipcond    800
    jump        Done   
    load        Incr   
    store       Pow
    load        D      
    store       J

Inner,  load        J       
    add         J
    subt        K
    skipcond    000
    jump        AftIn   
    load        J       
    add         J
    store       J
    load        Pow     
    add         Pow
    store       Pow
    
    jump        Inner   
    
AftIn,  load        K       
    subt        J
    store       K
    load        Answer  
    add         Pow
    store       Answer
            
    jump        Outer   

 Done,   load        K       
    skipcond    000
    jump        Disp
    load        Answer
    subt        Incr
Disp,   load        Answer  
    output
    halt
    
N,      dec         0      
D,      dec         0       
K,      dec         0       
J,      dec         0       
Pow,    dec         0       
Answer, dec         0       
Incr,   dec         1   

I am using a MarieSim JAR application from 2009 to run the code.

Answer 1

It seems that the assembler you're using doesn't like SUBT but that the assembly code is otherwise in good shape.  Maybe try SUB instead of SUBT.