Conan Cooking looks for deleted files - issue?

Hi all,

I am getting a mild warning while cooking, probably nothing gamebreaking, but I want to keep things tidy from the start.

It says it cant find the files newmaterial.uasset and newmaterial2.uasset in my mods folder, and if i am sure that they are nowhere referenced.
Since my mod is only about 1 mesh with certain materials that i double checked (and are properly named), I am sure that this is a false positive. I also dont think i referenced those materials anywhere. I just created them, then renamed and worked with them. They are neither present in my mods folder, nor in any references, nor in the content browser.

Is this much of an issue, can it be resolved, or should I ignore?

Thanks in advance