1D Model

Hallo there, I want to create a 1D Model (lake) and created a bth.npt with 3 segments. The segment number 1 and 3 are the boundary segments (inactive) with a cell width of 1 m and the segment number 2 is the active segment with a cell width of 100 m. And the active segment consists of 35 layers - see below: DLX 1.00000 100.000 1.00000 ELWS 96.8700 96.8700 96.8700 Angle 4.71000 4.71000 4.71000 Friction 35.0000 35.0000 35.0000 DZ 1.00000 1.00000 1.00000 1.00000 1.00000 1.00000 1.00000 1.00000 1.00000 1.00000 1.00000 1.00000 1.00000 1.00000 1.00000 1.00000 1.00000 1.00000 1.00000 1.00000 1.00000 1.00000 1.00000 1.00000 1.00000 1.00000 1.00000 1.00000 1.00000 1.00000 1.00000 1.00000 1.00000 1.00000 1.00000 Width of Segment #1 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 Width of Segment #2 0.00000 21687.6 21413.7 21147.2 20884.9 20627.6 20370.1 20113.5 19856.0 19597.0 19344.0 19093.1 18838.4 18571.6 18292.4 18019.4 17750.2 17482.3 17214.5 16944.5 16680.7 16414.1 16122.6 15792.2 15441.6 15012.9 14514.1 13926.5 13291.1 12451.7 10891.2 5197.72 6.08348 1.64193 0.00000 Width of Segment #3 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 Now, the preprocessor shows me an error: No active segments in branch 1 What's the problem? Isn't it possible to run the model with three segments? Can anybody help me? Thanks a lot! Michi