Sorry, this is the error: In file included from ../inc/spark_wiring.h:29:0, from ../inc/application.h:29, from lmt871.cpp:1: ../../core-common-lib/SPARK_Firmware_Driver/inc/config.h:12:2: warning: #warning "Defaulting to Release Build" [-Wcpp] #warning "Defaulting to Release Build" ^ In file included from ../inc/spark_wiring.h:29:0, from ../inc/application.h:29, from playground.cpp:2: ../../core-common-lib/SPARK_Firmware_Driver/inc/config.h:12:2: warning: #warning "Defaulting to Release Build" ...