If you get error 1124, this means that one or more buildings have lost the link to their ridge line(s). If a ridge line is deleted manually in AutoCAD, or you copy a building to another drawing, Novapoint Noise looses track of the link from building to line. This will trigger error 1124 during calculation.
To fix the problem, you need to redefine the ridge for the building in question. Normally the easiest way to do this will be to delete all buildings with the Noise Module function for deleting buildings, but without deleting the lines. Then run "Fetch buildings" to redefine all buildings and find ridge lines automatically.