Update: Error Fixed! ??
After I added the memory limit to 64MB in wp-config.php
define('WP_MEMORY_LIMIT', '64M');
and added this to the .htaccess file
<IfModule mod_security.c>
SecFilterEngine Off
SecFilterScanPOST Off
</IfModule>
I waited 10 minutes and tried to upload files and everything worked perfectly!