I was creating redo log groups to expand the size from 32 MB to 64 MB.
I created two groups and while creating next group group no 10 there was a problem in disk space availability and the group was not created.
Hence I tried to create redolog group again the operation fails giving message
ora-01185: logfile group no 10 is invalid.
Now I can not create any new redolog group since Oracle assigns next group number automatically.
How to come out of this situation ?