This application has no explicit mapping for error

Question

I used maven to follow the tutorial: https://spring.io/guides/gs/uploading-files/ step by step. All the codes that are used were copied from this tutorial.

The App runs, but I get the error:

Whitelabel Error Page This application has no explicit mapping for /error, so you are seeing this as a fallback. Tue Jun 30 17:24:02 CST 2015 There was an unexpected error (type=Not Found, status=404). No message available

Can someone help me with this issue?