def METHOD_NAME(self):
    for requirement_uid, file_links in self.map_reqs_uids_to_paths.items():
        for file_link in file_links:
            source_file_traceability_info: Optional[
                SourceFileTraceabilityInfo
            ] = self.map_paths_to_source_file_traceability_info.get(
                file_link.get_posix_path()
            )
            if source_file_traceability_info is None:
                raise StrictDocException(
                    f"Requirement {requirement_uid} references a file"
                    f" that does not exist: {file_link.get_posix_path()}."
                )