Forcing a failure/error

How can I force a failure using Postman? I want to see the error message that pops up when a failure happens while uploading an image to a website to check the size and the content of the message.
This is what the error message looks like:
force error

Hi @dbatu

I think you would need to provide more information.

What is the request that you are sending?
Could you provide a screenshot?

What condition would expect to trigger this error?
For example, if the file had an incorrect name or format?