Free Throw Lane Violation?

[Gargil]

Last night late in a boys varsity game team A was fouled and lined up for a 2 shot freethrow. Team B was huddling at mid court, A1 was shooting and A2 and A3 were occupying the second lane spaces. The L puts the ball at the disposal of the shooter and he misses, The L then calls a lane violation because nobody from Team B was occupying the first two lane spaces. A1 was awarded another try. Team B coach was not happy. Does the defensive team have to occupy the first two lane spaces? I thought they were not required to occupy these but the offensive team could not occupy the first two lane spaces. FYI, The shooter missed all 3 shots.