SQL ERROR

Error 4063 calling procedure:

ORA-04063: package body "TEIRADM.USER_REG" has errors
ORA-06508: PL/SQL: could not find program unit being called: "TEIRADM.USER_REG"
ORA-06512: at line 2

The last SQL statement executed was:

begin
  user_reg.main;
  commit;
end;