The only way, this tool can read the data is if the image is in its 100% original state, as made by the camera itself.
In order to achieve this, you should transfer the images to your computer via a card reader or via the USB cable which came with the camera.
If you have the camera at hand, follow this procedure:
take a photo with the camera, it can be with the lens cap on, or out of focus, it does not matter
a - connect the camera to the computer with the USB cable OR
b - remove the SD/CF/MS card from the camera and insert it into your card reader
navigate to the images on the camera/card with your file manager (Explorer on windows, finder on Mac OS, ...)
The images are usually found in the DCIM or 100MSDCF or similar folders
drag the latest image - usually the one with the highest number - to the "Drag images here" box in the tool
The tool should read the proper values
Things to AVOID in order to get a working result
Transfering the images with special software
Opening the images with any sort of editing software
(this is very important, as SONY stores the shutter data in such a way, that almost all image editors will destroy that data)