ORA-01624: log 1 needed for crash recovery of instance xe

SQL> alter system switch logfile;

System altered.

SQL> select * from v$Log;

    GROUP#    THREAD#  SEQUENCE#      BYTES    MEMBERS ARC STATUS           FIRST_CHANGE# FIRST_TIME
---------- ---------- ---------- ---------- ---------- --- ---------------- ------------- -------------------
         1          1         12 2147483648          1 NO  ACTIVE                  203704 2009-09-17 19:04:23
         2          1         11   52428800          1 NO  ACTIVE                  203206 2009-09-17 18:56:08
         3          1         13 2147483648          1 NO  CURRENT                 203710 2009-09-17 19:04:38
SQL>alter system checkpoint;

System altered.

SQL> select * from v$Log;

    GROUP#    THREAD#  SEQUENCE#      BYTES    MEMBERS ARC STATUS           FIRST_CHANGE# FIRST_TIME
---------- ---------- ---------- ---------- ---------- --- ---------------- ------------- -------------------
         1          1         12 2147483648          1 NO  INACTIVE                203704 2009-09-17 19:04:23
         2          1         11   52428800          1 NO  INACTIVE                203206 2009-09-17 18:56:08
         3          1         13 2147483648          1 NO  CURRENT                 203710 2009-09-17 19:04:38

SQL> alter database drop logfile group 2;

Database altered.