This warning message appears in the log file when a file has been copied (or an attempt to copy it has been made) using parallel worker threads but has not been processed. This happens when the profile is aborted. With parallel file copying, many smaller files are being copied at the same time a single larger file is being copied. At some point during the profile run, the result of that file copy will be checked and logged. If the profile is aborted before then, then it the result of that file copy has not been checked and processed, hence the warning message in the log file. If you are using File Integrity checking, for example, then the integrity database will not have been updated