There are several possible causes:
1. The EXIF data has been modified
DxO OpticsPro selects the appropriate correction module by reading an image’s EXIF data, particularly the proprietary information called “MakerNote.”
If you try to have DxO OpticsPro handle an image that has been previously modified by another software program, it is possible that the information necessary to identify the lens has been modified or deleted, meaning that DxO OpticsPro will not be able to associate your image with the correct module.
This is why DxO OpticsPro should always be the first program you use to modify or correct your images.
2. An ambiguity needs to be resolved
If this icon ( ) appears on the thumbnails, it means that several installed modules correspond to the images that you want to process. This situation is called an optics module ambiguity. Click on the icon to open the ambiguity resolution window. If one of the modules that has caused the ambiguity is no longer useful to you, we advise you to uninstall it.
3.Your version of DxO OpticsPro is not up to date
Verify that you have the latest version of DxO OpticsPro by using the “search for updates” command (in “Help” on a PC, and in the “DxO OpticsPro 7” menu on a Mac).
If you own version 6 or older, it may well be that the module for your camera-lens combination is only available from version 7 onwards.
4.You have the STANDARD edition and you are trying to process an image with a camera that is supported only by the ELITE edition.
You can check the link below to ensure that your camera is supported by the STANDARD edition: