Alchitry Cu tutorial not working

Absolute beginner to FPGA programming here. Trying to do the tutorial for my first FPGA project for the Cu, but my project won’t build. I keep getting the message “Bin file (C:\Users\User\Documents\Alchitry\LED\work\alchitry_imp\sbt\outputs\bitmap\cu_top_0_bitmap.bin) could not be found! The build probably failed.”
I’m on Labs version 1.2.6 and iceCube2 version 2017.1 on Windows.

Any help would be greatly appreciated.

Do you get anything else in the build console? Does iceCube2 open on its own if you start it outside Alchitry Labs?