"For" loop running partially

this is the question of which part 2 is to be solved. My code is working for 1st for loop, but showing error from the 2nd for loop. The error is as

Unable to perform assignment because the left and right sides have a different number of elements.

Error in Problem_3_4 (line 52)
    m2(i+1)=m2(i)+(dt/6)*(k1+(2*(k2+k3))+k4);

Thanks for your help in advance!

[Prakhar Jain]

Hi Kashfia, Capture.PNG cannot be opened. Please try attaching it again. Thanks.

[Stephen23]

@Prakhar Jain: I fixed that for you by putting the image markup onto its own line.

[Kashfia Mahin]

I have already solved it. Thanks for offering help