Horus on Debian / Camera missing exposure controls

Well, that was anticlimactic. Nothing happened, here’s the error message.

Starting Processing of 6 glued meshes out of 6 meshes
Computing Overlaps 6 glued meshes...
Computed 15 possible Arcs :
( 1/15)  3 ->  4 Failed Alignment of one arc 
( 2/15)  0 ->  5 Failed Alignment of one arc 
( 3/15)  1 ->  2 Failed Alignment of one arc 
( 4/15)  2 ->  3 Failed Alignment of one arc 
( 5/15)  1 ->  3 Failed Alignment of one arc 
( 6/15)  0 ->  2 Failed Alignment of one arc 
( 7/15)  0 ->  1 Failed Alignment of one arc 
( 8/15)  2 ->  4 Failed Alignment of one arc 
( 9/15)  1 ->  4 Failed Alignment of one arc 
(10/15)  1 ->  5 Failed Alignment of one arc 
(11/15)  2 ->  5 Failed Alignment of one arc 
(12/15)  3 ->  5 Failed Alignment of one arc 
(13/15)  4 ->  5 Failed Alignment of one arc 
(14/15)  0 ->  4 Failed Alignment of one arc 
(15/15)  0 ->  3 Failed Alignment of one arc 
Completed Mesh-Mesh Alignment

 Failure. No succesful arc among candidate Alignment arcs. Nothing Done.

nm, all you have to do is close the alignment tool.