Execute immediate on DBMS_METADATA.GET_DDL with error of ORA-01031: insufficient privileges

Question

I want to mirror a schema to a existing schema by creating DDL and recreate on the other schema with same name.
I wrote the code below:
create or replace
PROCEDURE                                    SCHEMA_A."MAI__DWHMIRROR"
AS
v_sqlstatement CLOB:='bos';
str varchar2(3999);
BEGIN
  select
    replace(
      replace(replace(
      replace(DBMS_METADATA.GET_DDL('TABLE','XXXX','SCHEMA_A'),'(CLOB)',''),';','')
    ,'SCHEMA_A'
    ,'SCHEMA_B'
  into v_sqlstatement
  from dual;
  select  CAST(v_sqlstatement AS VARCHAR2(3999)) into str from dual;
  execute immediate ''||str;
END;
And Executing this block with below code:
set serveroutput on
begin
SCHEMA_A.MAI__DWHMIRROR;
end;
But still getting the following error code:
Error report:
ORA-01031: insufficient privileges
ORA-06512: at "SCHEMA_A.MAI__DWHMIRROR", line 47
ORA-06512: at line 2
01031. 00000 -  "insufficient privileges"
*Cause:    An attempt was made to change the current username or password
           without the appropriate privilege. This error also occurs if
           attempting to install a database without the necessary operating
           system privileges.
           When Trusted Oracle is configure in DBMS MAC, this error may occur
           if the user was granted the necessary privilege at a higher label
           than the current login.
*Action:   Ask the database administrator to perform the operation or grant
           the required privileges.
           For Trusted Oracle users getting this error although granted the
           the appropriate privilege at a higher label, ask the database
           administrator to regrant the privilege at the appropriate label.

Answer 1

user5199319 wrote:
USER has DBA Role
when all  else fails Read The Fine Manual
DBMS_METADATA