Warning: mysql_fetch_array(): supplied argument is not a valid

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$sqlk=mysql_query("select * from konfirmasi,pemesanan,barang where pemesanan.idpsn=konfirmasi.idpsn and konfirmasi.idbrg=barang.idbrg and konfirmasi.idmember=pemesanan.idmember");
while($k=mysql_fetch_array($sqlk)){
$sqlm = mysql_query("select * from member where idmember='$rmember[idmember]' ");
$m=mysql_fetch_array($sqlm);
$sqlp = mysql_query("select * from pemesanan where idpsn='$k[idpsn]'");
$pesan=mysql_fetch_array($sqlp);
$sqlb = mysql_query("select * from barang where idbrg='$barang[idbrg]'");

$b=mysql_fetch_array($sqlb);
$i++;

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