Are you using the latest WIEN2k version? I think this gfortran error only occurred in a older WIEN2k version:

On 8/30/2017 11:30 PM, mandeep hooda wrote:
Dear Wien2k users,
                   I am facing problems in DOS calculations for spin-orbit 
coupling of non-magnetic case. I run the calculations according to youtube 
videos. Calculations converged without any error, but in DOS, it is showing 
error given below, which is difficult to understand. Please give some 
constructive suggestions. Thanking you in advance
At line 30 of file kptin_nv.F (unit = 10, file = './Zr3Te_SO.vectorup')
Fortran runtime error: Sequential READ or WRITE not allowed after EOF marker, 
possibly use REWIND or BACKSPACE
1.2u 0.0s 0:01.22 99.1% 0+0k 0+27384io 0pf+0w
error: command   /home/csy/wein2k/WEIN2k/lapwso lapwso.def   failed

Mandeep Kumar Hooda
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