Simple Invoices - Forum

When trying to update an invoice I get this error:

Fatal error: Allowed memory size of 262144 bytes exhausted (tried to allocate 77824 bytes) in /usr/......../include/init.php on line 163

Lines 158 - 166:

include_once("./include/sql_queries.php");
ini_set('max_file_uploads','20');
ini_set('memory_limit','128M');
ini_set('post_max_size','40M');

$smarty->register_modifier("siLocal_number", array("siLocal", "number")); // line 168
$smarty->register_modifier("siLocal_number_clean", array("siLocal", "number_clean"));
$smarty->register_modifier("siLocal_number_trim", array("siLocal", "number_trim"));
$smarty->register_modifier("siLocal_number_formatted", array("siLocal", "number_formatted"));

The error occurs at the $smarty functions.
How do I fix this??