oracle12c创建用户报错： invalid common user or role name

sys@LUOCS12C> !oerr ora 65096

65096, 00000, "invalid common user or role name"

// *Cause:  An attempt was made to create a common user or role with a name

//          that wass not valid for common users or roles.  In addition to

//          the usual rules for user and role names, common user and role

//          names must start with C## or c## and consist only of ASCII

//          characters.

// *Action: Specify a valid common user or role name.

//

根据错误提示了解，在CDB中用户得以C##开头，如下：

sys@LUOCS12C> create user c##luocs identified by oracle default tablespace luocs;

User created.