This application has no explicit mapping for /error

I used maven to do the tutorial https://spring.io/guides/gs/uploading-files/
All the codes I used was copied.

The Application can run, 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

How can I fix it?

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