Output in Fortran

[mp22222222222]

Hi everybody, 

am trying to make an output in a text file in my Fortran VUMAT file. 
it works well, when by writting the output on the screen : 
WRITE(*,*)  'Gamma=MVf=', gamma
but when i want it to write the variable gamma in a text file, the code is
running well but there is no .txt file produced!
 
here is my main loop where i tried to write the output request. 

 2000 continue
      call elastic(x,celas,c2,cdach,smises,e,xnu,emoda,
     & emodm,enua,enum,totstrain,gamma,detrans)
         OPEN(UNIT=12,FILE="MVolFrac.txt",status='new',ACTION="write")
         WRITE(12,*)'Gamma=MVf=',gamma

Does anybody have any idea regarding this problem ?
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