ERROR: array subscript out of range

Hello all,
Need ur help.I dont know wats wrong with the following fucntion.
create or replace function twoarray() returns setof integer as
'
declare
i integer;
j integer;
a integer[][];
begin
for i in 1..10 loop
for j in 1..2 loop
a[i][j]:=i*j;
return next a[i][j];
end loop;
end loop;
return;
end;
'
language 'plpgsql';

when i execute the following statement i get an error saying 'array
subscript out of range'

select * from twoarray();
ERROR: array subscript out of range
CONTEXT: PL/pgSQL function "twoarray" line 8 at assignment

Help me,please
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