'How can I debug nwilling to write output files compilation terminated in fortran?

Fortran compile error: It says: unwilling to write output files compilation terminated. Can you please take a look into my fortran code?

program potential implict none !variable real8 r, theta , V ! given variable integer4 n

  !assign values
  r = 0.82 ! unit in meter
  theta = pi/4
  x = cos(theta)
  n = 14                    ! i am using n = 14 for f14
  V = potential(r, theta,n) !
  !input/output

11 write(,) V ! "Electrical Potential at r= 0.82m and theta = pi/4 radian is", V

  end 
 
  
 
  !defining two functions and inside the funtion I am using conditions 

  function  potential(r, theta, n)

12 write(*, ) 2f(n, theta)/(r**15) go to 11

 ! end function potential

  function  potential(r, theta, n)
  write(*, *) 2*f(n, theta)/(r**15)
  go to 12
 ! end function potential

Fortran compile error: It says: unwilling to write output files compilation terminated.



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