All arrays must be of the same length

This error message is typically encountered in programming languages like Python, Java, or C++ when working with arrays or lists. It means that the arrays or lists that you are trying to use in your code are not of the same length, and therefore they cannot be compared or operated on together.

To resolve this error, you need to make sure that all of your arrays or lists have the same number of elements. You can do this by either adjusting the size of the arrays or lists to match each other, or by modifying your code to only work with elements that are present in all of the arrays or lists.

For example, if you have two arrays A and B that you want to add together element-wise, you would need to first check that both A and B have the same length before performing the addition operation:

if len(A) == len(B):
    C = [A[i] + B[i] for i in range(len(A))]
else:
    print("Error: Arrays must be of the same length")

In this code, we use the len() function to check the length of both A and B, and then perform the addition operation only if they are the same. If they are not the same, we print an error message instead.