Android : Dead Code Warnign with Physicaloid Library

I am trying to build the project Android-USB-Serial-Monitor-Lite by using the source code from here https://github.com/ksksue/Android-USB-Serial-Monitor-Lite.

Added the physicoloid library as mentioned here https://github.com/ksksue/PhysicaloidLibrary

But,I am getting Warnings(9) as Dead code as shown in the attached image.Every Warnign is related to the BuildConfig.DEBUG.

Can someone help me fixing this Dead Code warning.