gFortran读取.grd文件一直报错

Emp

gfortran在读取一个用grads读取的.nc文件生成的.grd文件时，一直报错，无法读取，求求大佬们帮忙看一看这个是f90文件
program main
    implicit none
    integer,parameter::it=73,jt=144,lt=30
    integer i,j,l
    real u(it,jt,lt),ux(it,jt),us(it,jt)
    open(1,file='D:\fortran\qitong\u.grd',form='unformatted',access='stream')
    do l=1,lt
        read(1) ((u(i,j,l),i=1,it),j=1,jt)
    end do
    close(1)
    do j=1,jt
        do i=1,it
            ux(i,j)=0
            us(i,j)=0
        end do
    end do
    do j=1,jt
        do i=1,it
            do l=1,lt
                ux(i,j)=ux(i,j)+u(i,j,l)
            end do
            ux(i,j)=ux(i,j)/lt
        end do
    end do
    do j=1,jt
        do i=1,it
            do l=1,lt
                us(i,j)=us(i,j)+(u(i,j,l)-ux(i,j))**2
            end do
            us(i,j)=((1.0/lt)*us(i,j))**0.5
        end do
    end do
    open(2,file='d:\fortran\qitong\ux1.grd',access='stream',form='unformatted')
    write(2)((ux(i,j),i=1,it),j=1,jt)
    close(2)
    open(3,file='d:\fortran\qitong\us1.grd',access='stream',form='unformatted')
    write(3)((us(i,j),i=1,it),j=1,jt)
    close(3)
end program main


这是他报错的
[Running] cd "d:\fortran\qitong\" && gfortran u.f90 -o u && "d:\fortran\qitong\"u
At line 8 of file u.f90 (unit = 1, file = 'D:\fortran\qitong\u.grd')
Fortran runtime error: End of file

Error termination. Backtrace:

Could not print backtrace: libbacktrace could not find executable to open
#0  0xffffffff
#1  0xffffffff
#2  0xffffffff
#3  0xffffffff
#4  0xffffffff
#5  0xffffffff
#6  0xffffffff
#7  0xffffffff
#8  0xffffffff
#9  0xffffffff
#10  0xffffffff
#11  0xffffffff
#12  0xffffffff
#13  0xffffffff

[Done] exited with code=2 in 0.302 seconds

Emp

朋友们，解决了，是文件长度出现了问题