Premiere now has a color management process to use on input at the user choice. And someone in the project added an Input LUT, to the folder listed in that warning. Premiere will look to that folder now that LUT as part of the input color management process.
And no, this is not the Lumetri LUT use.
So you need to find who added that input LUT to their local version of the project, and get that LUT distributed to that listed location for everyone.