"Cannot mix standby and online redo log file members for group %s"
*Cause: An attempt was made to add a log file member that did not match
the other member types. This problem typically occurs when adding
a standby log file member to an online redo log file group, or adding
an online redo log file member to a standby redo log file group.
*Action: Verify the log file group type using the TYPE column of the V$LOG