[SOLVED] Warning: mysqli_fetch_array()

kenapa ya saya mau menampilkan data dari database, tp ada error, sebelumnya bisa..

erronya : Warning: mysqli_fetch_array() expects parameter 1 to be mysqli_result, boolean given in /opt/lampp/htdocs/percobaan/coba.php on line 103

<?php
$koneksi = mysqli_connect('localhost','root','','skp') or die(mysqli_error());
function tampil_data($koneksi){
	$sql = "SELECT * FROM penilain";
	$query = mysqli_query($koneksi, $sql);

	echo "<fieldset>";
	echo "<legend><h2>Data Panen</h2></legend>";

	echo "<table border='1' cellpadding='10'>";
	echo "<th>No</th>
			<th style=width:400px;>Kegiatan</th>
			<th>AK</th>
			<th colspan=2>kuant/Out</th>
			<th colspan=2>Kual/Mutu</th>
			<th>Waktu</th><th>Biaya</th>
			<th>AK</th>
			<th colspan=2>kuant/output</th>
			<th colspan2>kual/mutu</th>
			<th colspan=2>waktu</th>
			<th>Biaya</th>
		  </tr>";

	while($data = mysqli_fetch_array($query)){
		?>