Error removing ACE / ACL

Trying to remove host ACE that has has NULL ACL and ACL_OWNER columns and no associated rows in dba_network_acl_privileges. Any ideas for surgically removing this network ACL?    

SQL> select * from sys.dba_network_acls where acl is null;

HOST                      LOWER_PORT UPPER_PORT ACL        ACLID            ACL_OWNER


------------------------- ---------- ---------- ---------- ---------------- ----------


myserver02                8071       8071                  0000000080002761
 

SQL> select * from sys.dba_network_acl_privileges where aclid = '0000000080002761';  

no rows selected.  

As SYS user:  

BEGIN
DBMS_NETWORK_ACL_ADMIN.REMOVE_HOST_ACE(

   host       => 'myserver02',
   lower_port => 8071,
   upper_port => 8071,
   ace        => xs$ace_type(privilege_list => xs$name_list('connect'),
                             principal_name => 'MY_PRINCIPAL_NAME',
                             principal_type => xs_acl.ptype_db),

ORA-01927: cannot REVOKE privileges you did not grant
ORA-06512: at "SYS.DBMS_NETWORK_ACL_ADMIN", line 1222
ORA-06512: at line 2