Wat betekent dit?

Warning: fopen(./cache/5_colored_name.dat) [function.fopen]: failed to open stream: Error 0 in /mnt/web8/52/86/51777786/htdocs/includes/functions.php on line 516

Warning: fputs(): supplied argument is not a valid stream resource in /mnt/web8/52/86/51777786/htdocs/includes/functions.php on line 517

Warning: fclose(): supplied argument is not a valid stream resource in /mnt/web8/52/86/51777786/htdocs/includes/functions.php on line 518

kan iemand me helpen aub?

dit staat op die line

function write($bestand, $schrijf){
	$file = fopen($bestand, "w");
	fputs($file, $schrijf); // wegschrijven in bestand
	fclose($file); // sluit bestandsverbinding 
}