I'm using nRF51822 Soc ( ARM cortex M0) an Iwant to include spi driver in my project . Those errors showed up and i didn't figure out how to correct them : ..\main.c(42): error: #5: cannot open source input file "app_util_platform.h": No such file or directory RTE\Board_Support\nRF51422_xxAC\bsp.c(13): error: #5: cannot open source input file "bsp.h": No such file or directory