"Some snapshots in the range [%s, %s] are missing key statistics."
*Cause: Some AWR tables encountered errors while creating one or more
snapshots in the given range. The data present in one or more of
these missing tables is necessary to perform an ADDM analysis.
*Action: Look in DBA_HIST_SNAP_ERROR to find what tables are missing
in the given snapshot range. Use the ERROR_NUMBER column in
that view together with the alert log to identify the reason
for failure and take necessary action to prevent such failures
in the future.
Try running ADDM on a different snapshot range that
does not include any incomplete snapshots.