Please quote the complete exact unedited word-for-word error message, leaving nothing out.
Please state the exact version NUMBER of your Lightroom. Do not tell us words like "most recent" version or "up to date".
Please tell us in a lot more detail (lots more detail) about what this means: "The files are CR2, Photoshop and my computer recognize the files fine but I can't get them in Lightroom."
Please state your operating system.
Please state what exact camera make and model took these CR2 photos.