Need help with error message

I don’t understand how to debug this error message:

7/1/2018 7:05:03 PM Strategy started
7/1/2018 7:05:11 PM *** ERROR task 1 failed - “arguments imply differing number of rows: 14401, 14400”
7/1/2018 7:05:11 PM Strategy ended


you’ll probably need to paste your code snippet that calls this function, so we know which command is tossing this error