Bring multiple targets into a common place

I've followed the instruction provided in this post https://developer.vuforia.com/forum/faq/android-how-can-i-bring-multiple-targets-common-space to enable multiple targets detection in common space. 

I have replaced all the "QCAR" to "Vuforia" in ImageTargets.cpp. However, I've encountered the following errors during compilation.

Error:(342, 40) error: no member named 'getNumActiveTrackables' in 'Vuforia::State'; did you mean 'getNumTrackables'?

Error:(345, 57) error: no member named 'getActiveTrackable' in 'Vuforia::State'; did you mean 'getTrackable'? Error:(347, 60) error: no member named 'getPose' in 'Vuforia::Trackable' Error:(379, 19) error: no member named 'getNumActiveTrackables' in 'Vuforia::State'; did you mean 'getNumTrackables'? Error:(400, 42) error: use of undeclared identifier 'projectionMatrix' Error:(427, 36) error: use of undeclared identifier 'normalHandle'

Are those methods deprecated from vuforia-sdk-android-6-5-19 ? 

I'll be glad if anyone will help me out in this.

Thank you.