Would you be able to translate the exact word-for-word error message into text (instead of a picture)? Or type the exact words of the error message in Cyrillic so we can translate it? Your title is not an exact translation.
OCR by Acrobat, translation by Google: "Failed to open Lightroom catalog with named "Lightroom Catalog ~" as it is already opened in another application. Close others, uroy e1 <Earth: p Lightro om n before the start."