Altere para:
$TABLES_CONFIGS['WEBCASH'] = array("database" => DATABASE, //webSite || MuOnline
"table" => "MEMB_INFO", //webCash || MEMB_INFO
"columnUsername" => "memb___id", //username || memb___id
"columnAmount" => "amount", //amount || gold
"columnAmount2" => "amount2", //amount2 || gold2...