error: invalid-union.asm(1):
    Found ENDU outside of a UNION construct
error: invalid-union.asm(2):
    Found NEXTU outside of a UNION construct
error: invalid-union.asm(3):
    UNIONs must be inside a SECTION
error: invalid-union.asm(7):
    Unterminated UNION construct
Assembly aborted with 4 errors!