When I navigate to my app in Splunk 6.3, why am I directed to the Splunk DB Connect page instead?

Hi Everyone, I have an app called abc on my Splunk 6.3 and I also use Splunk DB Connect 1.2.2. When I go to abc (i.e. go to splunkserver:8000/en-US/app/abc/home) I get the page of Splunk DB Connect. This did not happen in the past. I don't understand why Splunk shows me to the wrong page... The address bar in Chrome still shows the right address. In addition, there are errors in the page: ServerSideInclude Module Error! Splunk has failed to locate the template for uri:'/APP/abc/appserver/static/home.html' and the same error for files connect.html, explore.html, and inputs.html. How do I make Splunk show me my app again? Thanks in advance for your help :)