Fatal error: Allowed memory size of 134217728 bytes exhausted (tried to allocate 49792 bytes) in

Hello,
after enable modules thats what happened

Fatal error: Allowed memory size of 134217728 bytes exhausted (tried to allocate 49792 bytes) in /home/propsg4y/public_html/includes/cache.inc on line 350

i found that 350 line in cache.inc /What i have to do here?
================================
foreach ($result as $item) {
$item = $this->prepareItem($item);
if ($item) {
$cache[$item->cid] = $item;
}
}
$cids = array_diff($cids, array_keys($cache));
return $cache;
}
catch (Exception $e) {
// If the database is never going to be available, cache requests should
// return FALSE in order to allow exception handling to occur.
return array();
}
}

================================

i cant acces the site or the admin menu..
Sorry if i post same issue again, but i dont realy understand and need help.
So i read that adding a file php.ini in public_html helps, that right..nothing happened to me.

Somewhere i saw to add a line in settings.php and when i try to do that , says you dont have permission to do it.
so what i do

I use premium theme Real estast