404 Error

[Aayushi Acharya]

Hello,
I was going through the contributing page for Apache Apex:
http://apex.apache.org/contributing.html
and I found that under the Code Style sub-heading there is this line:
The checkstyle configuration that Apache Apex projects use is present here : 
https://github.com/apache/apex-core/blob/master/apex_checks.xml
The above link returns a 404 error.
Could someone kindly fix that?
Thank you, Aayushi Acharya