I got this error only when started using the last version Ray tracing works OK and I see the image on the detector. Whet setting merit function the error message says that this is an error in NSTR operand. The merit function is very simple
#    Type    Int1    Int2    Hx    Hy    Px    Py    Ex    Ey    Target    Weight    Value    Contrib    
1    NSDD    1    0    0,000000000000000E+000    0,000000000000000E+000    1,000000000000000E+000    0,000000000000000E+000    0,000000000000000E+000    0,000000000000000E+000    0,000000000000000E+000    0,000000000000000E+000    0,000000000000000E+000    0,000000000000000E+000
2    NSTR    1    1    1,000000000000000E+000    1,000000000000000E+000    1,000000000000000E+000    1,000000000000000E+000    0,000000000000000E+000    0,000000000000000E+000    0,000000000000000E+000    0,000000000000000E+000    0,000000000000000E+000    0,000000000000000E+000
3    NSDD    1    3    0,000000000000000E+000    0,000000000000000E+000    1,000000000000000E+000    0,000000000000000E+000    0,000000000000000E+000    0,000000000000000E+000    0,000000000000000E+000    1,000000000000000E+000    0,000000000000000E+000    0,000000000000000E+000
4    OPGT    3    0    0,000000000000000E+000    0,000000000000000E+000    0,000000000000000E+000    0,000000000000000E+000    0,000000000000000E+000    0,000000000000000E+000    1,000000000000000E+000    0,000000000000000E+000    0,000000000000000E+000    0,000000000000000E+000
 
What is wrong?