What just happened! Fatal Error: ISR_Support.h file not found (jkellar)

I opened my project after about 3 or 4 days and now it fails building due to this error: make: Entering directory 'C:/microchip/harmony/v1_06/apps/P-0082-Network_Module/firmware/P-0082-Network_Module.X'
../src/system_config/default/system_interrupt_a..