Root checker pro(com_joeykrim_rootcheckp-1.apk) is reporting root is not configured

Hi ..
I have built a custom rom using AOPS source of lollipop 5.1.1 with kernel 3.10.30..
Its booting in virtual box. I have built su along with source in /system/xbin directory.

I tried root checker pro apk(com_joeykrim_rootcheckp-1). but its always saying root is not configured properly.

Kindly help me