First, this is some general information about this error type with any tool.
Given that context: the first items to check are the input datasets and parameter choices. This tool happens to have great examples down in the Help section of the form, plus links to tutorial examples.
I would suggest comparing your run to those examples, making adjustments, and trying reruns. If you need help with this or get stuck, we can try to help more here and will need to review what you have so far to offer advice. How to share your work is in the banner topic at this forum, or please see here directly → How to get faster help with your question.