Sql script does not work

Hi experts.
I have the following script that is not running.

EXECUTE   'BEGIN DBMS_STATS.GATHER_TABLE_STATS(
                ownname => 'SYSADM'
                ,tabname => 'PSACCESSLOG'
                ,estimate_percent => NULL
                ,block_sample => FALSE
                ,method_opt => 'FOR ALL INDEXED COLUMNS'
                ,degree => DBMS_STATS.AUTO_DEGREE
                ,cascade => FALSE
        );END;'

EXECUTE   'BEGIN DBMS_STATS.GATHER_TABLE_STATS(
                ownname => 'SYSADM'
                ,tabname => 'PSAPMSGPUBCON'
                ,estimate_percent => NULL
                ,block_sample => FALSE
                ,method_opt => 'FOR ALL INDEXED COLUMNS'
                ,degree => DBMS_STATS.AUTO_DEGREE
                ,cascade => FALSE
        );END;'

EXECUTE   'BEGIN DBMS_STATS.GATHER_TABLE_STATS(
                ownname => 'SYSADM'
                ,tabname => 'PSAPMSGPUBERR'
                ,estimate_percent => NULL
                ,block_sample => FALSE
                ,method_opt => 'FOR ALL INDEXED COLUMNS'
                ,degree => DBMS_STATS.AUTO_DEGREE