------ Build started: Project: Sketch1, Configuration: Debug AVR ------ Build started. Project "Sketch1.cppproj" (default targets): Target "PreBuildEvent" skipped, due to false condition; ('$(PreBuildEvent)'!='') was evaluated as (''!=''). Target "CoreBuild" in file "C:\Program Files (x86)\Atmel\Studio\7.0\Vs\Compiler.targets" from project "C:\Users\mackw\OneDrive\Documents\Arduino\Sketch1\Sketch1\Sketch1.cppproj" (target "Build" depends on it): Task "RunCompilerTask" Shell Utils Path C:\Program Files (x86)\Atmel\Studio\7.0\shellUtils C:\Program Files (x86)\Atmel\Studio\7.0\shellUtils\make.exe all --jobs 4 --output-sync Building target: Sketch1.elf Invoking: AVR8/GNU Linker : 5.4.0 "C:\Program Files (x86)\Atmel\Studio\7.0\toolchain\avr8\avr8-gnu-toolchain\bin\avr-g++.exe" -o Sketch1.elf -Wl,-Map="Sketch1.map" -Wl,--start-group -Wl,-lm -Wl,--end-group -Wl,--gc-sections -mmcu=atmega2560 -B "C:\Program Files (x86)\Atmel\Studio\7.0\Packs\atmel\ATmega_DFP\1.2.209\gcc\dev\atmega2560" C:\Users\mackw\OneDrive\Documents\Arduino\Sketch1\Sketch1\Debug\Makefile(95,1): error: recipe for target 'Sketch1.elf' failed C:/Program Files (x86)/Atmel/Studio/7.0/Packs/atmel/ATmega_DFP/1.2.209/gcc/dev/atmega2560/avr6/crtatmega2560.o:../../../../crt1/gcrt1.S:310: undefined reference to `main' collect2.exe(0,0): error: ld returned 1 exit status make: *** [Sketch1.elf] Error 1 The command exited with code 2. Done executing task "RunCompilerTask" -- FAILED. Done building target "CoreBuild" in project "Sketch1.cppproj" -- FAILED. Done building project "Sketch1.cppproj" -- FAILED. Build FAILED. ========== Build: 0 succeeded or up-to-date, 1 failed, 0 skipped ==========