Questions about UEL

Hi everybody,

I have a UEL for truss element (T3D2). I'm calling and reading some .dat files inside of the UEL. I'm just reading these files inside of the UEL without doing anything to them or with them (It's just a test case). Here is an example:

      OPEN(101, file="C:\Users\ak1070\Desktop\UMAT-UEL-UELMAT\UEL TEST\V1.dat", status='old',form='formatted',&
                    &action='read',position='rewind')  
      READ(101,*) AEVectors(1,:)      
      CLOSE(101)

      .

      .

      .

      OPEN(164, file="C:\Users\ak1070\Desktop\UMAT-UEL-UELMAT\UEL TEST\V64.dat", status='old',form='formatted',&
                    &action='read',position='rewind')  
      READ(164,*) AEVectors(64,:)      
      CLOSE(164)

I'm supposed to call and read 64 files. But it's just working for 38 files. When I'm calling 38 files it's working perfectly. I Mean:

      OPEN(101, file="C:\Users\ak1070\Desktop\UMAT-UEL-UELMAT\UEL TEST\V1.dat", status='old',form='formatted',&
                    &action='read',position='rewind')  
      READ(101,*) AEVectors(1,:)      
      CLOSE(101)

      .

      .

      .

      OPEN(138, file="C:\Users\ak1070\Desktop\UMAT-UEL-UELMAT\UEL TEST\V38.dat", status='old',form='formatted',&
                    &action='read',position='rewind')  
      READ(138,*) AEVectors(38,:)      
      CLOSE(138)

But, when I'm calling 39 files the results change to sth weird. I thought maybe sth is wrong with data so, I called one of the previous files twice to make the total number of files 39 and still the results change to sth weird.

      OPEN(101, file="C:\Users\ak1070\Desktop\UMAT-UEL-UELMAT\UEL TEST\V1.dat", status='old',form='formatted',&
                    &action='read',position='rewind')  
      READ(101,*) AEVectors(1,:)      
      CLOSE(101)

      .

      .

      .

      OPEN(138, file="C:\Users\ak1070\Desktop\UMAT-UEL-UELMAT\UEL TEST\V38.dat", status='old',form='formatted',&
                    &action='read',position='rewind')  
      READ(138,*) AEVectors(38,:)      
      CLOSE(138)

      OPEN(138, file="C:\Users\ak1070\Desktop\UMAT-UEL-UELMAT\UEL TEST\V38.dat", status='old',form='formatted',&
                    &action='read',position='rewind')  
      READ(138,*) AEVectors(38,:)      
      CLOSE(138)

It would be very kind of you to let me have your advice.

Thanks in advance.

Best Regards,