exec immediate ..... why

VSQL := L1.V1

invalid character

ORA-00911: invalid character

ORA-06512: at line 26

DECLARE

  CURSOR C1 IS

    SELECT 'grant all on ' || OWNER || '.' || TABLE_NAME || ' to CAMA;' V1

      FROM ALL_TABLES

     WHERE OWNER LIKE 'CAMA%'

       AND OWNER <> 'CAMA';

BEGIN

VSQL VARCHAR2(250);

  FOR L1 IN C1 LOOP

  

    VSQL := L1.V1;

    EXECUTE IMMEDIATE VSQL;

  END LOOP;

END;

/