"archived log thread %s sequence %s not found in backup set"
*Cause: The indicated archived log file was named explicitly for
restoration but is not contained in this backup set.
*Action: This message is issued when the directory from the first backup
piece is read and one or more files named for restoration were not
found. The restore conversation is still active, but no data
has been read and you must supply the first backup piece of
a backup set that contains all of the requested files.