Fail to read data file

I am now using the Parallel Studio XE 2015 Composer Edition for Fortran combined with Xcode 6.3 to run a program.

The program was made in order to read data from file first and then go for some further computation.

I had all my f90 files (including the main program and the modules) in the Project folder and it did compile and run.

But when I tried to input the file name and load the file, it seemed that it failed to read the file.

I have my code like this

.......

CHARACTER(LEN = 20) :: fileName

INTEGER :: iNode

REAL(KIND = dp) :: xBox, yBox, zBox

WRITE(*,'(A)', ADVANCE = "NO") "Input file name: "

READ(*,*) fileName

OPEN(1, FILE = TRIM(fileName)//'.in' , STATUS = 'UNKNOWN')

READ(1,*) iNode, xBox, yBox, zBox

........

When I ran the program and input the file name it simply returned forrtl: severe (24): end-of-file during read, unit 1...

I though it might be due to failure to find the file though I had put the data file (output.in) in the same folder as other .f90 files, as well as add it to the project. 

I am just wondering how to deal with this issue (I thought it might be a reference/file location issue of Xcode, since this program is running well on other fortran compiler.)

Thanks.

-Abright