XML / PHP Problem

[cassisdesign]

Does anyone know about this error that i am receiving?

ERROR: Cannot write XML data to printers.xml

Warning: fwrite(): supplied argument is not a valid stream resource in /home/thinkcas/public_html/requestaquote/class.xml.php on line 157

Warning: fclose(): supplied argument is not a valid stream resource in /home/thinkcas/public_html/requestaquote/class.xml.php on line 158

The lines of code that is shows as an error are the following:
157) write($fp,$this->getXML());
158) fclose($fp);


the website is:http://thinkcassis.com/requestaquote/

This happens when I go to manage printers and try to add a printer or delete a printer.

Any help would be AWESOME! :)

[oesxyl]

Does anyone know about this error that i am receiving?

ERROR: Cannot write XML data to printers.xml

Warning: fwrite(): supplied argument is not a valid stream resource in /home/thinkcas/public_html/requestaquote/class.xml.php on line 157

Warning: fclose(): supplied argument is not a valid stream resource in /home/thinkcas/public_html/requestaquote/class.xml.php on line 158

The lines of code that is shows as an error are the following:
157) write($fp,$this->getXML());
158) fclose($fp);

$fp is not valid. Check value returned by fopen before you use it.

regards