[Wien] Spin-orbital calculation always stop at LAPW2

[Lo_wan_2005XW]

Dear all,

I am trying to perform the calculation with spin-orbital interaction. So exactly following the userguide, 
I first do the normal scf calculaction without SO-effect. The calculation finish smoothly without any warnning 
in all output and scf files.

Then I save the calculation, and do initso. 

After that, I run "runsp_lapw -so"

The calculation always stop at LAPW2:
--------------------------------------------------------------------------
 LAPW1 END
 LAPW1 END
LAPWSO END
L2main - QTL-B Error
 
>   stop error
 
[1]+  Exit 9                  runsp_lapw -so
---------------------------------------------------------------------------