Non-reflecting BC problem
 

I've encountered the difficulty to run turbine-specific non-reflecting boundaty conditions in 3d model. All preliminary conditions/ limitations have been accounted for, i guess. When turning on this conditions I get the error message
"Error: Internal error at line 3490 in file '..\..\src
rbc.c'.
spline error: x values not monotonically increasing
Error Object: #f "

If anybody interested and could help, I may post simple case/data file for detailed consideration.