Error message: "Measuring device settings do not match." / "The selected measuring device could not be found. Do you want to keep the current device selected?"

Check the Spectroproofer backing color on your printer and in GMG ColorProof

GMG ColorProofuses the white measuring backing color by default. Please check this setting: Output > Printers >  Available Printers  >  Open the properties of the printer  > General Settings > Printer Settings > Backing

The backing color defined in the printer must correspond. Please check this setting on your printer. Here is an example of an Epson Surecolor SC-P7500, for which the setting is found on the printer display under: Menu > Status > Spectroproofer > Backing color > white

 For the Epson Surecolor SC-P7000 the setting is found on the printer display under: Menu > Option Setup > Spectroproofer > SProofer Status > Backing color

Does the printer state that the backing color is grey?

In this case, the measuring unit is dirty.

1. Please remove the measuring unit.
2. Clean the measuring background and the white tile.
3. Reinstall the measuring unit.

You can find detailed instructions on the listed steps in the maintenance section of the Epson user manual, which you can download from the manufacturer's website.

What can I do if Grey is still displayed as backing color after cleaning?